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'Hydrogen Bonds' in keywords Facet section ZfN Section A [X]

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1	Author	Snezhana Bakalova	Requires cookie*
	Title	S
	Abstract	o lv e n t E f fe c ts o n th e F lu o re s c e n c e P r o p e r tie s o f M e th y ld ih y d ro q u in o lin o n e s The absorption and fluorescence spectra and the fluorescence quantum yields of two methyl-2,3-dihydro-4(lH)-quinolinones in various solvents are reported. In some solvents deuteration-induced fluorescence enhancement has been observed. The solvent effects in aprotic solvents are consistent with the general type of solvent interaction. For protic solvents, solute-solvent complexation in the excited state is suggested.
	Reference	Z. Naturforsch. 46a, 823—827 (1991); received May 24 1991
	Published	1991
	Keywords	Fluorescence, Dihydroquinolinones, Hydrogen bond
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	Identifier	ZNA-1991-46a-0823
	Volume	46

2	Author	M. Grottel, A. Kozak, Z. Pająk	Requires cookie*
	Title	*H and 19 F NMR Study of Cation and Anion Motions in Guanidinium Hexafluorozirconate
	Abstract	Proton and fluorine NMR second moments and spin-lattice relaxation times of polycrystalline guanidinium hexafluorozirconate and its deuterated analogue were studied in laboratory (60 MHz) and rotating (H, = 20 G) frames over a wide range of temperature. An analysis of the experimental results enabled us to reveal a dynamical inequivalence of two crystallographically independent cations and an unexpected high mobility of nonspherical anion dimers. A comparison of the ions dynamics in 2:1 complex studied with the guanidinium 1:1 and 3:1 complexes has shown a significant contribution of the hydrogen bonds to the potential barriers hindering the anion reorien-tations. At low temperatures a proton motion in the hydrogen bond and at 400 K a solid-solid phase transition have been discerned.
	Reference	Z. Naturforsch. 51a, 991—996 (1996); received May 14 1996
	Published	1996
	Keywords	NMR, Ion Motions, Hydrogen Bonds, Phase Transitions
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	TEI-XML for	default:Reihe_A/51/ZNA-1996-51a-0991.pdf
	Identifier	ZNA-1996-51a-0991
	Volume	51

3	Author	Nobuo Nakamura, Hirotsugo Masui, Takahiro Ueda	Requires cookie*
	Title	Effect of Intermolecular Hydrogen Bonding on the Nuclear Quadrupole Interaction in Imidazole and its Derivatives as Studied by ab initio Molecular Orbital Calculations
	Abstract	Ab initio Hartree-Fock molecular orbital calculations were applied to the crystalline imidazole and its derivatives in order to examine systematically the effect of possible N-H---N type hydrogen bond-ing on the nuclear quadrupole interaction parameters in these materials. The nitrogen quadrupole coupling constant (QCC) and the asymmetry parameter (r?) of the electric field gradient (EFG) were found to depend strongly on the size of the molecular clusters, from single molecule, to dimer, trimer and to the infinite molecular chain, i.e., crystalline state, implying that the intermolecular N-H -N hydrogen bond affects significantly the electronic structure of imidazole molecule. A certain correla-tion between the QCC of l4 N and the N-H bond distance R was also found and interpreted on the basis of the molecular orbital theory. However, we found that the value of the calculated EFG at the hy-drogen position of the N-H group, or the corresponding QCC value of 2 H, increases drastically as /C* when R is shorter than about 0.1 nm, due probably to the inapplicability of the Gaussian basis sets to the very short chemical bond as revealed in the actual imidazole derivatives. We suggested that the ob-served N-H distances in imidazole derivatives should be re-examined.
	Reference	Z. Naturforsch. 55a, 315—322 (2000); received August 26 1999
	Published	2000
	Keywords	Hydrogen Bond, Nuclear Quadrupole Interaction, Molecular Orbital, Imidazole
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	TEI-XML for	default:Reihe_A/55/ZNA-2000-55a-0315.pdf
	Identifier	ZNA-2000-55a-0315
	Volume	55

4	Author	Taka-Aki Nihei, Shin'. Ichi, Ishimaru, Ryuichi Ikeda	Requires cookie*
	Title	C1 NQR Studies of Hydrogen Transfer in Crystalline /7-Chlorobenzoic Acid
	Abstract	35 C1 NQR frequencies and spin-lattice relaxation times 7, Q were measured inp-ClC 6 H 4 C0 2 H(PCB A) and p-ClQF^CC^DtPCBA-d,) at 77-333 K. T lQ in PCB A gave a shallow minimum of 8.0 ms at ca. 110 K, which could be explained by a double proton transfer mechanism in the carboxylic acid dimer referring to *H NMR data giving a T 1H minimum at almost the same temperature. PCBA-d, showed temperature dependent NQR frequencies quite analogous to those in PCBA, whereas their r 1Q behavi-our was quite different in its minimum value and its temperature as well as temperature gradient. These results were explained by suppressed deuteron tunnelling and the Ubbelohde effect.
	Reference	Z. Naturforsch. 55a, 355—358 (2000); received August 27 1999
	Published	2000
	Keywords	CI NQR, Hydrogen-Bond, Hydrogen-transfer, Tunneling
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	TEI-XML for	default:Reihe_A/55/ZNA-2000-55a-0355.pdf
	Identifier	ZNA-2000-55a-0355
	Volume	55

5	Author	Masao Hashimoto, Akiko Shono, Yoshiyuki Mido, Haruo Niki, Hiroshi Hentona, Koichi Mano	Requires cookie*
	Title	Narrowing of the 3 5 CI NQR Lines of Trichloroacetamide Caused by Its Ferroelectric Phase Transition
	Abstract	Dielectric measurements on single crystals and DSC of the title compound (monoclinic, space group P2 X) revealed a ferroelectric transition at ca. 355 K (AH xs 0.5 kJ mol"Powder x-ray diffraction indicated that the high temperature phase is also monoclinic and the change in volume at the transition is very small. A displacement of hydrogen atoms is considered as responsible for the appearance of ferroelectricity. The 35 C1 NQR signals at ca. 77 K were considerably broad, but a drastic narrowing took place after the compound had once experienced the phase transition. A tentative assignment of the NQR spectrum was made from a calculation of the NQR frequencies based on the CNDO/2 method. Another phase transition was evidenced by a small drift of the DSC curve and a slight anomaly of the dielectric behavior around 358 K. The present *H NMR experi-ments gave no indication of the onset of torsional motion of the NH 2 group reported to occur at ca. 210 K.
	Reference	Z. Naturforsch. 45a, 327—333 (1990); received August 26 1989 in revised form November 1 1989
	Published	1990
	Keywords	NQR, Phase transition, Ferroelectricity, Hydrogen bond, Disordered structure
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	TEI-XML for	default:Reihe_A/45/ZNA-1990-45a-0327.pdf
	Identifier	ZNA-1990-45a-0327
	Volume	45

6	Author	Masao Hashimoto, Takahiro Isono, Haruo Niki, Takuya Higa	Requires cookie*
	Title	Fade-Out of 35 C1 NQR in Chloral n-Butylhemiacetal
	Abstract	Continuous wave and pulsed NQR, dielectric absorption and infrared (IR) measurements were carried out to investigate the origin of the peculiar temperature dependence of the S/N ratio of the 35 C1 NQR in the title compound. The dielectric and IR experiments evidenced a thermally activated jumping motion of the H atom participating in O-H O H-bonds. As T x and T 2 below 120 K were much longer than T 2 * of about 10 us, the line broadening in this temperature region was attributed to static lattice defects. A random freezing of the jumping motion may be the origin of the defects. In the range 120-170 K, S/N was extremely low and T 2 was less than 10 \|is, probably having a minimum in between. The short T 2 is considered to be responsible for the low S/N. A minimum of S/N at about 240 K is attributed to a 7\ minimum (less than 10 (is) at that temperature.
	Reference	Z. Naturforsch. 45a, 472—476 (1990); received August 26 1989 in revised form December 1 1989
	Published	1990
	Keywords	NQR, Relaxation times, Hydrogen bond, Dielectric absorption, Disordered structure
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	TEI-XML for	default:Reihe_A/45/ZNA-1990-45a-0472.pdf
	Identifier	ZNA-1990-45a-0472
	Volume	45

7	Author	Takashige Shimizu, Tetsuo Asaji, Daiyu Nakamura, Ryuichi Ikeda	Requires cookie*
	Title	Uniaxial Reorientation of Octahedral Complex Anions Excited in Triethylammonium Hexachlorostannate (IV) Crystals
	Abstract	The temperature dependence of the 35 C1 NQR spin-latticew relaxation time T1Q has been deter-mined for the three resonance lines observed in [(C2H5)3NH]2SnCl6. The higher frequency lines fade out around 150 K upon heating, whereas the lowest line shows up to room temperature no anomaly, although these three lines are assigned to chlorines belonging to the same complex anion. The T1Q values of the higher two lines decrease exponentially around the fade-out temperature, where T iq of the lowest line shows no such behavior. These results are explained by the onset of uniaxial reorientations of the octahedral complex ions by 90° about the Cl-Sn-Cl axis containing the lowest frequency chlorines. The activation energy (£J of this reorientation (22-24 kJ moP 1) is the lowest so far reportd for [SnCl6] 2-ions. £a about the other axes is 67 kJ mop 1 , indicating a remarkable anisotropic reorientation.
	Reference	Z. Naturforsch. 47a, 283—287 (1992); received July 19 1991
	Published	1992
	Keywords	Spin-Lattice Relaxation, NQR, NMR, Reorientational Motion, Hydrogen Bond
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	TEI-XML for	default:Reihe_A/47/ZNA-1992-47a-0283.pdf
	Identifier	ZNA-1992-47a-0283
	Volume	47

8	Author	Yoshio Kume, Maki Tokoro, Tetsuo Asaji, Ryuichi Ikeda, Daiyu Nakamura	Requires cookie*
	Title	Reorientational Motion of Hydrogen Bonded Octahedral Complex Anions in Hydrazinium Hexachlorostannate(IV), (N 2 H 5 ) 2 SnCl 6 , as Studied by 35 C1 NQR Spin-Lattice Relaxation Measurements
	Abstract	The temperature dependences of NQR frequencies and spin-lattice relaxation times, T1Q, of 35 C1 in (N2H5)2SnCl6 were measured. Four NQR signals distributed in a fairly wide frequency range were observed, the lowest-frequency line exhibiting an anomalous positive temperature coefficient. The highest-frequency line showed a steep temperature dependence. These results could be interpreted by considering the intermolecular interaction between CI and -NH2 in N2H^. Below ca. 250 K, T1Q of the upper three signals exhibited a gradual decrease upon heating, explainable by lattice vibra-tions, while a shallow Tig minimum, ascribable to the modulation of electric quadrupole interaction, was observed at ca. 11ÖK for the lowest-frequency signal. The reorientation of [SnCl6] 2 ~ was elucidated to be highly anisotropic, in that it reorients about one of the CI-Sn-Cl axes much more frequently than about the other two axes. The activation energies were determined to be 62 and 94 kj mol -1 for the respective reorientations.
	Reference	Z. Naturforsch. 47a, 288—292 (1992); received July 17 1991
	Published	1992
	Keywords	Key word: Spin-Lattice Relaxation, NQR, NMR, Reorientational Motion, Hydrogen Bond
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	TEI-XML for	default:Reihe_A/47/ZNA-1992-47a-0288.pdf
	Identifier	ZNA-1992-47a-0288
	Volume	47

9	Author	Takeshi Kyan, Hamagawa, Takahiro Isono, Masao Hashimoto	Requires cookie*
	Title	Hiroshi
	Abstract	The crystal structure of cyclohexylhemiacetal (cycHx-CH) was determined at 296 K: monoclinic, space group P2 Jc, a =1028.7 (9), b = 609.5 (1), c = 1811.9 (4) pm, and ß = 99.79 (3)°, Z -4, R = 0.0552. The three 5s Cl NQR lines in cycHx-CH, T., T2, and T2*, were measured by a pulsed method at 80-300 K. Below 200 K Tf 1 obeyed the T law well, indicating that the spin lattice relaxation is governed by lattice vibrations. The reorientation of CC13 seems to be responsible for the sharp T: drop observed above 250 K. Shoulders in the T { vs. 1/T curves indicate the presence of Ti minima at about 240 K. A fluctuation of the EFG due to a dynamic disorder of hydrogen atoms in the OH groups is assumed to explain the T x minima.
	Reference	Z. Naturforsch. 47a, 299 (1992); received July 25 1991
	Published	1992
	Keywords	Chlorine NQR, Spin-lattice relaxation, Hydrogen bond, Crystal structure
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	TEI-XML for	default:Reihe_A/47/ZNA-1992-47a-0299.pdf
	Identifier	ZNA-1992-47a-0299
	Volume	47

10	Author	Ivar Olovsson, Halina Ptasiewicz-Bak, GarryJ. Mclntyre	Requires cookie*
	Title	Superposition and Polarization Effects on the Electron Density of Lone Pairs
	Abstract	There appears to be conflicting experimental evidence on the redistribution of the electron density in the lone-pair and other regions of a molecule due to the interaction with its nearest neighbours. In some experimental as well as theoretical deformation density maps a decrease in the lone-pair density has been reported, whereas in other cases an increase has been found. It appears that two major, counteracting factors are responsible for these differences (apart from experimental errors in the diffraction studies and limited accuracy in the theoretical calculations): an increase in the lone-pair density is expected due to the polarizing influence of the neighbours, whereas simple superposition of the isolated monomer deformation densities will lead to an apparent decrease due to the overlap with the negative contours of the neighbouring atom. Depending on which of these factors is the dominant one, an increase or decrease may thus be observed. These points are illustrated by recent results on nickel sulfate hexahydrate and some other hydrogen-bonded compounds. The electron density based on the fitted deformation functions of all atoms in the structure is compared with the individual densities calculated from deformation functions of the separate monomers. In this way the effects of simple superposition of the individual densities have been studied, and a partitioning of the electrostatic and polarization contributions to the hydrogen bonds and other relatively weak bonds to the oxygen lone-pairs attempted.
	Reference	Z. Naturforsch. 48a, 3—11 (1993); received January 30 1992
	Published	1993
	Keywords	Electron density, Superposition effects, Polarization effects, Lone pairs, Hydrogen bonds
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	TEI-XML for	default:Reihe_A/48/ZNA-1993-48a-0003.pdf
	Identifier	ZNA-1993-48a-0003
	Volume	48

11	Author	Masao Hashimoto, Shuji Matsumoto, Masakazu Kunitomo, Haruo Niki, Hirotaka Odahara, Katsuji Tamaki	Requires cookie*
	Title	35C1 NQR Relaxation and Hydrogen Bond in Some Chloral Hemiacetals
	Abstract	The crystal structure of chloral ethylhemiacetal has been determined at 291 K: monoclinic, space group C f -P 2 lt Z = 2, a = 854.5(1), b = 594.0(3), c = 853.3(1) pm, ß = 108.30(2)°, R = 0.0962. A sharp decrease of the spin lattice relaxation time 7i found for the 35C1 N Q R o f the CC13 groups in chloral methyl-, ethyl-and n-heptylhemiacetals is attributed to the onset of reorientation of the group over a potential barrier o f ca. 39, 37, and 32 kJ/m ol, respectively. An unusual vs. 1/T curve with a 7i minimum superimposed on the sharp decrease of 7\ due to the reorientation was observed for each of the three Cl N Q R lines of nH p-C H . This phenom enon is tentatively ascribed to a fluctuation of EFG caused by jum ping m otion o f the hydrogen atom s in the OH groups.
	Reference	Z. Naturforsch. 49a, 279 (1994); received August 16 1993
	Published	1994
	Keywords	Crystal structure, Hydrogen bond, Chlorine N Q R, Spin lattice relaxation
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	Identifier	ZNA-1994-49a-0279
	Volume	49

12	Author	J.M M Cordeiro	Requires cookie*
	Title	Effective Pair Potentials and Structure of Water
	Abstract	Classical Monte Carlo calculations have been performed in order to investigate the ability of the TIP4P, SPC, and SPCE water models to reproduce the structural features of liquid water. The simula-tions were carried out in the NPT ensemble at 4 thermodynamic conditions. The results are compared with recent neutron diffraction data. Essentially, the three models capture equally well the thermody-namic and structural features of water. Although they were parametrized to reproduce the water prop-erties at ambient conditions, the agreement with the experimental pair correlation functions was even better at supercritical conditions. This is because the effective pair potentials have some difficulty to re-produce cooperative interactions, like hydrogen bonds. These interactions are less effective at super-critical conditions, where the liquid behaves roughly like a gas
	Reference	Z. Naturforsch. 54a, 311—316 (1999); received December 16 1998
	Published	1999
	Keywords	Monte Carle Simulation, Non-polarizable Water Models, Radial Distribution Functions, Hydrogen-bonds
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	TEI-XML for	default:Reihe_A/54/ZNA-1999-54a-0311.pdf
	Identifier	ZNA-1999-54a-0311
	Volume	54

13	Author	Masao Hashimoto, Takahiro Isono, Noriko Yomesaka, Haruo Niki, Hiroshi Kyan, Takeshi Hamagawa	Requires cookie*
	Title	Reorientation of the CC1 3 Group in Chloral 4-Chlorobenzyl- hemiacetal. A Pulsed 35 C1 NQR and X-ray Study
	Abstract	The crystal structure of the title compound was determined at 291 K: monoclinic, space group C^h-P21/n, Z = 4, a = 1693.2(1), 6 = 579.3(1), c = 1232.5(1) pm, and ß = 107.21 (1)°, R = 0.0415. A sharp decrease of of Cl NQR found at T> 270 K for the CC13 group is attributed to the reorientation of the group over a potential barrier of ca. 50 kJ/mol. Intermolecular interactions between the CC13 and the neighboring atoms seem to dominate the magnitude of the potential barrier. T{~ 1 of the 35 C1 NQR of the Cl atom on the benzene ring obeyed the T 2 law well in the range 80 < T/K <270, while at T>280 K it deviated from the T 2 law.
	Reference	Z. Naturforsch. 47a, 293—298 (1992); received July 25 1991
	Published	1992
	Keywords	Crystal structure, Hydrogen bond, Chlorine NQR, Spin lattice relaxation, Atom-atom potential method
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	TEI-XML for	default:Reihe_A/47/ZNA-1992-47a-0293.pdf
	Identifier	ZNA-1992-47a-0293
	Volume	47

14	Author	B. N. Figgis, E. S. Kucharski, M. Vrtis	Requires cookie*
	Title	Spin Transfer through Hydrogen Bonding in [CO(NH 3 ) S (OH 2 )\| \|Cr(CN) 6 \| ?
	Abstract	A polarised-neutron diffraction experiment on [Co(NH 3) 5 (H 2 0)][Cr(CN) 6 ] shows the unexpected features of spin populations on the cobalt ((0.5(2) e) and the "ammine" hydrogen (0.8(1) e in total) atoms. A local density approximation DV-Xa calculation on a unit that models the molecular geometry in the crystal returns features that are broadly in agreement with the experiment. The calculation also reproduces the major features of a charge density experiment on the complex, including the low (+1.6 e) charges on the ions, in place of the formal ±3 e.
	Reference	Z. Naturforsch. 48a, 123—126 (1993); received October 14 1991
	Published	1993
	Keywords	Spin density, Hydrogen bond, Local density approximation calculation, Charge den-sity, Spin transfer
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	TEI-XML for	default:Reihe_A/48/ZNA-1993-48a-0123.pdf
	Identifier	ZNA-1993-48a-0123
	Volume	48

15	Author	Hiroshi Miyoshi, Keizo Horiuchi, Narumi Sakagami, Kenichi Okamoto, Ryuichi Ikeda	Requires cookie*
	Title	C1 NQR, H NMR, and X-Ray Diffraction Studies in a Hydrogen Bonded Complex Na 2 PtCl 6 6H z O
	Abstract	The 35 C1 NQR frequencies, spin-lattice relaxation time and X H NMR relaxation time were measured on crystalline Na 2 PtCl 6 • 6H z O at 77-350 K. The presence of three nonequivalent chlo-rine sites found by X-ray diffraction measurement is in agreement with the observed three NQR lines, which have different temperature dependences attributable to differences in the direction of H-bonding with water molecules. The three NQR lines correspond to three kinds of chlorines with different Pt-Cl distances and H-bond directions.
	Reference	Z. Naturforsch. 53a, 603—607 (1998); received October 31 1997
	Published	1998
	Keywords	CI NQR, X-Ray Diffraction, Spin-Lattice Relaxation, Quadrupole Coupling Constant, Hydrogen Bond
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	TEI-XML for	default:Reihe_A/53/ZNA-1998-53a-0603.pdf
	Identifier	ZNA-1998-53a-0603
	Volume	53

16	Author	Takahiro Ueda, Shigenori Nagatomo, Hirotsugu Masui, Nobuo Nakamura, Shigenobu Hayashi	Requires cookie*
	Title	Hydrogen Bonds in Crystalline Imidazoles Studied by 15 N NMR and ab initio MO Calculations
	Abstract	Intermolecular hydrogen bonds of the type N-H...N in crystals of imidazole and its 4-substituted and 4,5-disubstituted derivatives were studied by 15 N CP/MAS NMR and an ab initio molecular orbital (MO) calculation. In the 15 N CP/MAS NMR spectrum of each of the imidazole derivatives, two peaks due to the two different functional groups, >NH and =N-, were observed. The value of the I 5 N isotrop-ic chemical shift for each nitrogen atom depends on both the length of the intermolecular hydrogen bond and the kind of the substituent or substituents. It was found that the difference between the experimen-tal chemical shifts of >NH and =N-varies predominantly with the hydrogen bond length but does not show any systematic dependence on the kind of substituent. The ab initio MO calculations suggest that the hydrogen bond formation influences the 15 N isotropic chemical shift predominantly, and that the difference between the 15 N isotropic chemical shift of >NH and =N-varies linearly with the hydrogen bond length.
	Reference	Z. Naturforsch. 54a, 437—442 (1999); received March 31 1999
	Published	1999
	Keywords	15 N CP/MAS NMR, Imidazoles, Hydrogen Bond, 15 N Chemical Shift, ab initio MO Calculation
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	TEI-XML for	default:Reihe_A/54/ZNA-1999-54a-0437.pdf
	Identifier	ZNA-1999-54a-0437
	Volume	54

17	Author	Takahiro Ueda, Nobuo Nakamura	Requires cookie*
	Title	Nature of Hydration Water in (±)-Tris(ethylenediamine)cobalt(III) Chloride Hydrate, (±)-[Co(en) 3 ]Cl 3 -/iH 2 0, as Studied by *H, 2 H, and 17 O Solid State NMR
	Abstract	The static and dynamics properties of hydration water molecules in (±)-[Co(en) 3 ]Cl 3 were studied by means of 'H, 2 H, and ,7 0 solid state NMR. By 'H pulsed field gradient (PFG) NMR the apparent diffusion coefficient of mobile water through a micropore along the crystalline unique c-axis was found to be 1.0 x 10~ 9 m 2 s -1 . The 2 H NMR spectrum at 141 K consists of two components, one being a Pake doublet corresponding to a quadrupole coupling constant (QCC) of (226 ± 2) kHz and an asymmetry parameter of the electric field gradient 77 of 0.08 ± 0.01, and another being a Gaussian line with a linewidth of 3.5 kHz. The 17 0 NMR spectrum at 300 K also consists of a narrow Gaussian peak and a broad powder pattern with a second order quadrupole effect corresponding to QCC = (6.3 ± 0.5) MHz and 77 = 0.55±0.02. The broad and narrow components are assigned to water molecules accommodated at general 12g positions and special 2a and 2b positions in the trigonal lattice with space group Plcl. From the ratio of the populations at these positions their potential energy difference was estimated to be between (2.7 ±0.1) and (3.5 ± 0.1) kJmol -1 . The 2 H NMR spectrum at room temperature indicates a finite quadrupole interaction which is attributable to the rapid rotation of water molecule about the molecular C 2 -axis. When the water content exceeds 2.7, the QCC is reduced sharply to (5.0 ±0.1) kHz at 285 K, suggesting that there occurs rapid rotation of water and rapid exchange of 2 H between nonequivalent positions.
	Reference	Z. Naturforsch. 55a, 362—368 (2000); received August 23 1999
	Published	2000
	Keywords	(±)-[Co(en) 3 ]Cl 3, Absorbed Water, Molecular Motion, Hydrogen Bond, Quadrupole Interaction
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	TEI-XML for	default:Reihe_A/55/ZNA-2000-55a-0362.pdf
	Identifier	ZNA-2000-55a-0362
	Volume	55