| | 1 | Author
| Crystal, FrankH. Artm Anna, D. Ietrich, M. Ootz, Reinhard Schwesinger | Requires cookie* | | | Title
| Zur Kristallchemie ungeladener Phosphazen-Basen, I [1] Strukturen zweier Hydrate und eines Acetats von Tris(dimethylamino)methyliminophosphoran  | | | | Abstract
| C hem istry o f U ncharged Phosphazene Bases, I [ 1 ] Structures o f Two H ydrates and an A cetate o f T ris(dim ethylam ino)m ethylim inophosphorane Two hydrates and an acetate of the uncharged, very strong phosphazene base tris(dimethylamino)methyliminophosphorane, (Me2N)3P=NMe (for short Me-P]), have been characterized by their crystal structures. A monohydrate, Me-P, • H:0 , mp. 3°C, is monoclinic | | | |
Reference
| Z. Naturforsch. 51b, 1369—1374 (1996); eingegangen am 11. März 1996 | | | |
Published
| 1996 | | | |
Keywords
| Crystal Structure, Hydrate, Hydrogen Bonding, Phosphazene, Uncharged Base | | | |
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| default:Reihe_B/51/ZNB-1996-51b-1369.pdf | | | | Identifier
| ZNB-1996-51b-1369 | | | | Volume
| 51 | |
| 2 | Author
| Cl Walter, Frank, GuidoJ. Reiß | Requires cookie* | | | Title
| Spezielle Alkylammoniumhexachlorometallate, II [1] Synthese und Kristallstruktur von Bis(l,2-diammoniopropan)hexachlororhodat(III)-chlorid, [H3N-CH(CH3)-CH2-NH3]2[RhCl6]Cl Alkylammonium Hexachlorometallates, II [1] Synthesis, and Crystal Structure of Bis( 1,2-diammoniopropane) Hexachlororhodate(III) Chloride, (H3N-CH(CH3)-CH9-NH3]-,|RhCl6] | | | | Abstract
| Bis(1,2-diammoniopropane) hexachlororhodate(III) chloride, [H ^N -CH tCI-fO -CH i-N H ^ [RhCl6]Cl (1) has been obtained by the reaction of rhodium(III) chloride with rac-1,2-diammoniopropane dihydrochloride in hydrochloric acid solution. The quasi-ternary com pound, which crystallizes in the orthorhombic space group Pbca (a -11.0007(13) A, b = 22.181(2) A, c = 14.638(2) A, V = 3571.7(7) Ä \ T = -1 2 0 °C, Z -8) contains two crystallographically independent 1,2-diammoniopropane ions beside one hexachlororhodate and one chloride ion. One of the cations shows a R/S-S/R-disorder of enantiomeric pairs in the centrosymmetric crystal lattice. The packing scheme is determined by a complex framework of hydrogen bonds. | | | |
Reference
| Z. Naturforsch. 51b, 1459—1463 (1996); eingegangen am 9. April 1996 | | | |
Published
| 1996 | | | |
Keywords
| Hexachlororhodate, Alkylammonium Salt, Crystal Structure, Hydrogen Bonding | | | |
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| default:Reihe_B/51/ZNB-1996-51b-1459.pdf | | | | Identifier
| ZNB-1996-51b-1459 | | | | Volume
| 51 | |
| 3 | Author
| Walter Frank, GuidoJ. Reiß | Requires cookie* | | | Title
| Spezielle Alkylammoniumhexachlorometallate, III [1] Synthese und Kristallstruktur von Tris(guanidinium)- hexachlororhodat(III)-monohydrat, [C(NH2)3 ]3 [RhCl6] * H20 Alkylammonium Hexachlorometallates, III [1] Synthesis, and Crystal Structure of Tris(guanidinium) Hexachlororhodate(III) Monohydrate, [C(NH2)3]3[RhCl6] * H20 | | | | Abstract
| Tris(guanidinium) hexachlororhodate(III) monohydrate, [C(NH2)3]3[RhCl6] • H20 (1) has be en obtained by the reaction of rhodium(III) chloride with guanidine hydrochloride in hydrochlo ric acid solution. 1 crystallizes in the triclinic space group P i (o = 7.6013(9) A, b = 8.6912(10) A, c = 15.956(2) Ä, q = 93.177(10)°, ß = 101.691(10)°, 7 = 113.995(9)°, V = 931.8(2), Z = 2). Two crystallographically independent hexachlororhodate ions, three crystallographically independent guanidinium ions and one water molecule are linked by a complex framework of hydrogen bonds. | | | |
Reference
| Z. Naturforsch. 51b, 1464—1468 (1996); eingegangen am 9. April 1996 | | | |
Published
| 1996 | | | |
Keywords
| Hexachlororhodate, Guanidinium Salt, Crystal Structure, Hydrogen Bonding | | | |
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| default:Reihe_B/51/ZNB-1996-51b-1464.pdf | | | | Identifier
| ZNB-1996-51b-1464 | | | | Volume
| 51 | |
| 4 | Author
| DietrichK. Breitinger, Roman Breiter | Requires cookie* | | | Title
| | | | | Abstract
| ?ram-(NH4)2[R u (S 0 3)2(N H 3)4]-4 H 20 (1) (m onoclinic, P l x!n\ a = 629.8(3), b = 1000.6(2), c = 1345.7(5) pm, ß = 112.25(4)°, Z = 2; R = 0.021; R w = 0.017) is obtained as pale greenish-yellow crystals by reaction of /ra « s-[R u (S 0 3H)2(N H 3)4] (2) with aqueous ammonia, and crys tallization at +5 °C. The compound, when isolated, is stable at room temperature for only a few days even under inert gas, but persists under the mother liquor. In the centrosymmetric anion frö/?s-[Ru(S03)2(N H 3)4]2~ the bonds Ru-S = 230.5(1) pm are significantly longer than in the neutral complex 2 (227.6(1) pm), whereas the Ru-N bonds are the same in both com plexes within experimental error (averages 214.1 and 214.0 pm). Hence, the mutual trans-influence of the sulfite ligands is weakened on protonation; the bonding of the co-ligands in c/s-position is not affected. The internal structure o f the sulfite ligand in 1 with long S-O bonds (average 151.2(5) pm) and small angles O-S-O (average 106.1(6)°) and the weakened Ru-S bond are a good match. The structure of 1 is held together by a complex network of hydrogen bonds, in which all potential hydrogen-bond donors (O H 2, N H 4+, N H 3) and accep tors (H 20 , S 0 3) are involved. The structural findings are reflected in the vibrational spectra. | | | |
Reference
| Z. Naturforsch. 51b, 517 (1996); received August 25 1995 | | | |
Published
| 1996 | | | |
Keywords
| Ruthenium(II) Sulfito Complex, Crystal Structure, m ws-Influence, Hydrogen Bonding | | | |
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| default:Reihe_B/51/ZNB-1996-51b-0517.pdf | | | | Identifier
| ZNB-1996-51b-0517 | | | | Volume
| 51 | |
| 5 | Author
| Thomas Dahlems, Dietrich Mootz, Michaela Schilling | Requires cookie* | | | Title
| Zweidimensionales Eis und H50 2+-Ionen. Zur Bildung und Struktur tiefschmelzender molekularer und ionischer Hemi-bis Hexahydrate halogenierter Essigsäuren CCl"F3."COOH (n = 1 bis 3) [1] Two-Dimensional Ice and H 50 2+ Ions. On Formation and Structure of Low-Melting Molecular and Ionic Hemi-through Hexahydrates of Haloacetic Acids CCl"F3."COOH (n = 1 to 3) [1] | | | | Abstract
| Hydrate formation o f haloacetic acids CCl"F3_"COOH (n = 1, 2, 3) has been studied by D TA and tem perature-dependent X-ray powder diffraction, and evidence obtained for five phases, all melting at temperatures below ambient. The hydrates have been confirmed and further characterized by their crystal structures at -1 5 0 °C. Three lower hydrates, CC12F C O O H 0.5H -> 0 (space group P2,/c and Z = 8 formula unites per unit cell), CC1F2C 0 0 H H 20 (P2,/c, Z = 4), and CC1F2C 0 0 H -4 H 20 (P I, Z = 2), have molecular structures with the acid and water m olecules hydrogen-bonded in two-dimensional arrays. The structures of the remaining hydrates, CCl2F C O O H -6H 20 and CC13C 0 0 H -6 H 20 (sim i lar, but not isotypic, both P 1 and Z = 2), are ionic, as (H s0 2+)(C X 3C 0 Ö) -4 H 20 , and three-dimensional. The neutral water molecules are hydrogen-bonded in ice-like layers rare in crystal chemistry. A lso, CCl2FCOOH is established only as the second acid o f which a lower hydrate is molecular and a higher one ionic. | | | |
Reference
| Z. Naturforsch. 51b, 536 (1996); eingegangen am 16. Oktober 1995 | | | |
Published
| 1996 | | | |
Keywords
| Crystal Structure, Haloacetic Acid Hydrate, Hydrogen Bonding, Melting Diagram | | | |
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| default:Reihe_B/51/ZNB-1996-51b-0536.pdf | | | | Identifier
| ZNB-1996-51b-0536 | | | | Volume
| 51 | |
| 6 | Author
| G. Gowri, Tina Briere, Sudha Srinivas, Hwa-Suck Cho, T. P. Das, M. Frank, W. Kreische, K.V S Rama Rao | Requires cookie* | | | Title
| Theory of Nuclear Quadrupole Interactions in Solid Fluoromethanes with Implanted l9 F* Nuclei. Coupling of HF* and Host Molecule | | | | Abstract
| The Quadrupole Coupling Constant e 2 qQ and Asymmetry Parameter rj of fluorine for fluorine-substitute methane compounds are calculated using the Hartree-Fock Roothaan procedure. Our results are compared with experimental data from measurements by the Time Differential Perturbed Angular Distribution (TDPAD) technique using excited 19 F* (spin 5/2) nuclei. The theoretical e 2 qQ's for the 19 F* nuclei in the fluoromethanes are in good agreement with experimental results. For CH 2 F 2 and CHC1F 2 molecules, where finite rj are expected from symmetry considerations, our results for ri are small, 0.12 and 0.05 respectively, in agreement with experimental observation. Besides the F* coupling constants associated with the C-F bonds in fluoromethanes, additional interesting NQI parameters, close to those in solid hydrogen fluoride, are observed in the TDPAD measurements. It is demonstrated through investigations of the total energies and electric field gradients that these additional NQI parameters for the fluoromethanes can be explained by a HF* molecule hydrogen-bonded through the hydrogen to a fluorine atom in the host molecular systems. This complexing of an ionic molecule to the host molecules in organic solids containing strongly electronegative atoms is expected to be a general feature in both implantation and conventional techniques. | | | |
Reference
| Z. Naturforsch. 51a, 565—571 (1996); received March 8 1996 | | | |
Published
| 1996 | | | |
Keywords
| Nuclear Quadrupole Interaction, 19 F* (nuclear excited state), Fluoromethane, Hartree-Fock Calculation, Hydrogen Bonding | | | |
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| default:Reihe_A/51/ZNA-1996-51a-0565.pdf | | | | Identifier
| ZNA-1996-51a-0565 | | | | Volume
| 51 | |
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