| | 1 | Author
| Christian Dietz, FrankW. Heinemann, Andreas Grohmann | Requires cookie* | | | Title
| Uniform Sidearm Derivatisations in a Tetrapodal Pentaamine: Ligands with NN4 O4 Donor Sets, and a Bis(Ferrocenecarbaldehyde Aminal)  | | | | Abstract
| The tetrapodal pentaamine 2,6-C5H3N[CMe(CH2NH2)2l2 (pyN_u 1) readily reacts with four equivalents of 2-hydroxyphenyl-substituted carbonyl compounds, such as (i) 2-hydroxybenz-aldehyde, (ii) 2,4-dihydroxybenzaldehyde, (iii) 3,5-di-rm-butyl-2-hydroxybenzaldehyde, and (iv) 2-hydroxyacetophenone, to give the corresponding Schiff base derivatives with N N 4O .1 donor sets (i: 2; ii: 3, iii: 4; iv: 5). With ligand 5, two transition metal complexes (M = Ni1 (6), Cu1 1 (7)) have been isolated, which are dinuclear and contain square-planar M(N202) units, linked by a pyridine-derived spacer whose nitrogen atom is uncoordinated. The reaction of 1 with ferrocenecarbaldehyde affords, under neutral conditions and irrespective of an excess of the aldehyde present, the bis(aminal) 8 as the major product, in which the two 1,3-propylenediamine subunits of 1 have condensed with two carbaldehyde moieties to give two 1,3-diazacyclohexane rings. All compounds have been characterised by IR spectroscopy and elemental analysis, as well as 'H and l3C NMR spectroscopy (except paramagnetic 7). The crystal structures of compounds 2, 6, 7, and 8 have been determined. | | | |
Reference
| Z. Naturforsch. 55b, 1037—1044 (2000); received July 28 2000 | | | |
Published
| 2000 | | | |
Keywords
| Nonadentate Ligand, Schiff Base, Nickel | | | |
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| default:Reihe_B/55/ZNB-2000-55b-1037.pdf | | | | Identifier
| ZNB-2000-55b-1037 | | | | Volume
| 55 | |
| 3 | Author
| T. Sogo, J. Romero, A. Sousa, A. De Blas, M. L. Durán, E. E. Castellano | Requires cookie* | | | Title
| The Electrochemical Synthesis of Neutral Zinc(II) Complexes of Schiff Base Ligands: The Crystal Structure of Bis[N-(4-methylphenyl)salicylaldiminato]zinc(II) | | | | Abstract
| The electrochemical synthesis and physico-chemical properties of neutral zinc(II) complexes of bidentate Schiff bases derived from salicylaldehydes are presented together with the X-ray struc-ture of bis[N-(4-methylphenyl)salicylaldiminato]zinc(II). The crystal is monoclinic, a = 21.877(3), b = 8.801(2), c = 12.027(5) Ä, ß = 96.55(3)°, space group C2/c. The complex is a monomer, and the zinc atom is tetrahedrally coordinated. | | | |
Reference
| Z. Naturforsch. 43b, 611—615 (1988); received November 5 1987/January 28. 1988 | | | |
Published
| 1988 | | | |
Keywords
| X-Ray, Zinc, Schiff Bases, Electrochemical Synthesis | | | |
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| default:Reihe_B/43/ZNB-1988-43b-0611.pdf | | | | Identifier
| ZNB-1988-43b-0611 | | | | Volume
| 43 | |
| 4 | Author
| Henri Brunner, M. Arkus, N. Iem Etz, M. Anfred Zabel | Requires cookie* | | | Title
| Optisch aktive Ubergangsmetall-Komplexe, 122 [1]. Synthese von Palladium(II)-Schiff-Base-Komplexen -intramolekulare Wechselwirkungen O ptically Active Transition M etal C om plexes, 122 [1], Synthesis of Palladium (II) Com plexes w ith Schiff B ase Ligands -Intram olecular Interactions | | | | Abstract
| Imines of salicylaldehyde and 2,6-diformyl-p-cresol have been used as ligands in palla d iu m ^) complexes. Enantiomerically pure ligands give enantiomerically pure complexes, racemic ligands give racemates and meso-forms. Differences between the respective isomers of the ligands within the complexes and between the diastereomers of the complexes were investigated. Crystal structure analyses established the trans configuration at the metal center. | | | |
Reference
| Z. Naturforsch. 55b, 145—154 (2000); eingegangen am 25. Oktober 1999 | | | |
Published
| 2000 | | | |
Keywords
| Schiff Bases, Palladium(II) Complexes, Diastereomers, Crystal Structure | | | |
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| default:Reihe_B/55/ZNB-2000-55b-0145.pdf | | | | Identifier
| ZNB-2000-55b-0145 | | | | Volume
| 55 | |
| 6 | Author
| E. M. Ilia Bértolo2, RufinaB. Astidaa ', A. Ndrés De Blasb, D. Avid, E. Fenton0, A. Lejandro, M. Acíasa, A. Dolfo, R. Odrígueza, Teresa Rodríguez-B, A. Lasb, V. Na, Illar1 | Requires cookie* | | | Title
| Four Novel N 3 O 4 Donor Macrocycles and their Lanthanide(III) Complexes | | | | Abstract
| A new series of lanthanide(III) complexes with two novel Schiff-base macrocycles, L 1 and L2, containing a N3O4 donor set have been prepared by cyclocondensation of 2,6-bis(2-formylphen-oxymethyl)pyridine and l,2-bis(2-aminophenoxy)ethane or l,3-bis(2-aminophenoxy)propane, respectively, in the presence of the appropriate metal salt as a template agent. In the absence of the metal salt the macrocycles are not formed. The diamine macrocycles L3 and L4 are also formed by reaction of the corresponding diamine and dicarbonyl precursors followed by an in situ reduction with NaBH4. Their complexation potential towards Ln(III) ions were also investigated. | | | |
Reference
| Z. Naturforsch. 53b, 1445—1454 (1998); received July 3 1998 | | | |
Published
| 1998 | | | |
Keywords
| Template Synthesis, Lanthanide(III) Complexes, Oxaazamacrocycle, Schiff-Base, Ion Selectivity | | | |
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| default:Reihe_B/53/ZNB-1998-53b-1445.pdf | | | | Identifier
| ZNB-1998-53b-1445 | | | | Volume
| 53 | |
| 7 | Author
| Miki Hasegawa, Yasunori Yamada+, Ken-Ichi Kumagai, Toshihiko Hoshi | Requires cookie* | | | Title
| Electronic Structure of 2,6-Bis{./V-(2-hydroxyphenyl)immoinethyl}-4-methylphenol | | | | Abstract
| The electronic and molecular structure of 2,6-bis{/V-(2-hydroxyphenyl)iminomethyl}-4-methylphenol (hpimp) is clarified from the m easurements of electronic absorption and 'H NMR spectra in various solvents and an X-ray diffraction analysis, together with MO calcula tions. Electronic absorption bands of hpimp are at 422, 397.9, 359, 341, 294.3, 265.8, and 224 nm in the non-polar solvent cyclohexane. In polar solvents, such as methanol, an additional band which is assigned to a partly formed keto-am ine hpimp, is observed at 499 nm. From the ]H NM R spectra it is seen that hpimp exists in the enol-imine form in non-polar solvents, and as an equilibrium mixture of enol-imine and keto-amine forms in polar solvents. Each electronic absorption band of solid hpimp in a KBr disk is broadened compared with the solution state, and an additional band, again assigned to the keto-amine form, appears around 499 nm. A n X-ray diffraction analysis shows that hpimp assumes a keto-amine structure in the solid state, and forms a column structure along the c-axis. MO calculations suggest that the enol-imine hpimp has a twist structure around the two C -C single bonds, the twist angle being 100° to 120°. | | | |
Reference
| Z. Naturforsch. 54b, 929—9 (1999); received January 8 1999 | | | |
Published
| 1999 | | | |
Keywords
| Schiff Base, Electronic Structure Polarization Spectrum, X-Ray Data, MO Calculation | | | |
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| default:Reihe_B/54/ZNB-1999-54b-0929.pdf | | | | Identifier
| ZNB-1999-54b-0929 | | | | Volume
| 54 | |
| 8 | Author
| Ümmühan Dodofp, Nurcan Özdemirb, Milka Karacanb, Ch, SpiroM. Georgievac, MiglenaE. Konstantinov0, Stefanova6 | Requires cookie* | | | Title
| Nicolay I | | | | Abstract
| Three novel Schiff bases: salicylaldehyde methanesulfonylhydrazone (1), 2-hydroxyaceto-phenone methanesulfonylhydrazone (2) and 2-hydroxy-1-naphthaldehyde methanesulfonylhy drazone (3) have been synthesized. Compounds 1-3, as well as acetone methanesulfonylhydra zone (4) have been characterized by TLC, 'H NMR and IR spectra. The spectroscopic results for 1-3 have revealed the presence of an intramolecular hydrogen bond between the hydroxyl group and the imine N atom. The conformational isomerism of 1-4 with respect to the rota tions around the SN and NN bonds have been studied by the method of molecular mechanics. Compounds 1-4 and methanesulfonylhydrazine exhibit antibacterial and cytotoxic effects. | | | |
Reference
| Z. Naturforsch. 54b, 1553—1562 (1999); received July 31 1999 | | | |
Published
| 1999 | | | |
Keywords
| Schiff Bases, Methanesulfonylhydrazine, 'H NMR Data, M olecular Mechanics, Cytotoxic Activity | | | |
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| default:Reihe_B/54/ZNB-1999-54b-1553.pdf | | | | Identifier
| ZNB-1999-54b-1553 | | | | Volume
| 54 | |
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