名称:
X-ray crystal structures of trans-(10-amino-3,7-diazadecanoato) dinitrocobalt(III) hydrate, mer(N)-(9-amino-3,7-diazanonato) dinitrocobalt(III) sesquihydrate, mer(N)-{N-(2-aminoethyl-N-(3-aminopropyl)glycinato} dinitrocobalt(III) hydrate and mer-(1,6-diamino-3-azahexane) trinitrocobalt(III)
摘要:
X-ray structure analyses have been made on single crystals of trans-[Co(3,3-ma)(NO2)(2)]. H2O (1), mer(N)-[Co(2,3-ma)(NO2)(2)]. 1.5H(2)O (2), mer(N)-[Co(i-2,3-ma)(NO2)(2)]. H2O (3) and mer-[Co(NO2)(3)(2,3-tril)] (4); where H(3,3-ma) stands for 10-amino-3,7-diazadecanoic acid H2NCH2CH2CH2NHCH2CH2CH2NHCH2 COOH, H(2,3-ma) for 9-amino-3, 7-diazanonanoic acid H2NCH2CH2NHCH2CH2CH2NHCH2COOH, H(i-2,3-ma) for N-(2-aminoethyl)-N-(3-aminopropyl)glycine (H2NCH2CH2)N (CH2CH2CH2NH2)CH2COOH and 2,3-tri for 1,6-diamino-3-azahexane. 1, 3 and 4 crystallize as a racemate in a monoclinic space group P2(1)/n, 2 as a racemate in a triclinic space group P (1) over bar. In 1, the two nitro ligands coordinate to cobalt (III) at the trans position of the octahedron. In 2, 3 and 4, the polydentates coordinate to cobalt (III) with their three amino nitrogen atoms on a meridian of the octahedron. In these complexes, the trimethylenediamine rings assume the chair structure and the nitro ligand planes are anchored by intermolecular and intramolecular hydrogen bonds to amine protons or to protons of the water of crystallization. (C) 1997 Elsevier Science Ltd.