Preparation, structure, and spectral characterization of bis[D-.beta.-(2-pyridyl)-.alpha.-alaninato]nickel(II), Ni(D-Pyala)2

Autor:	Robert A. Jacobson, Robert J. Angelici, Stephen R. Ebner, Barbara J. Helland
Rok vydání:	1980
Předmět:	Inorganic Chemistry Circular dichroism Nickel Crystallography Molecular geometry Absorption spectroscopy chemistry X-ray crystallography chemistry.chemical_element Context (language use) Crystal structure Physical and Theoretical Chemistry Monoclinic crystal system
Zdroj:	Inorganic Chemistry. 19:175-180
ISSN:	1520-510X 0020-1669
DOI:	10.1021/ic50203a036
Popis:	The complex (Ni(D-Pyala)/sub 2/).2H/sub 2/O was prepared by reaction of NiCO/sub 3/ with D-/sup +/H/sub 3/NCH(CH/sub 2/C/sub 5/H/sub 4/N)CO/sub 2//sup -/, D-PyalaH, the tridentate analogue of histidine. It was established from three-dimensional x-ray diffraction data that of the three possible isomeric forms the configuration of the complex in the crystalline state is that in which the amino nitrogen atoms are mutually trans. The crystals were monoclinic, of space group P2/sub 1/, with a = 14.942 (4) A, b = 12.091 (2) A, c = 10.090 (2) A, ..beta.. = 90.3 (3)/sup 0/, V = 1815.58 A/sup 3/, d/calcd/ = 1.556 g/cm/sup 3/, Z = 4, ..mu.. = 11.1 cm /sup -1/ for Mo, K..cap alpha.., and R = 0.084. The visible spectrum of the complex suggests that the ligands remain tridentate in aqueous solution, and the circular dichroism spectrum is consistent with the complex having the same configuration as in the solid state. The structural and spectral results are discussed in the context of related complexes. 5 figures, 4 tables.
Databáze:	OpenAIRE
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