X-RAY CRYSTAL-STRUCTURES OF NS-(10-AMINO-3,7-DIAZADECANOATO)DINITROCOBALT(III) HYDRATE, MER(N)-(9-AMINO-3,7-DIAZANONATO) DINITROCOBALT(III)SESQUIHYDRATE, R(N)-(N-(2-AMINOETHYL)-N-(3-AMINOPORPYL)GLYCINATO) DINITROCOBALT(III) HYDRATE AND MER-(1,6-DAIMINO-3-AZAHEXANE)TRINITROCOBALT(III)

X-ray structure analyses have been made on single crystals of trans-[C o(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 H2NC H2CH2CH2NHCH2CH2CH2NHCH2 COOH, H(2,3-ma) for 9-amino-3, 7-diazanonanoi c acid H2NCH2CH2NHCH2CH2CH2NHCH2COOH, H(i-2,3-ma) for N-(2-aminoethyl) -N-(3-aminopropyl)glycine (H2NCH2CH2)N (CH2CH2CH2NH2)CH2COOH and 2,3-t ri for 1,6-diamino-3-azahexane. 1, 3 and 4 crystallize as a racemate i n a monoclinic space group P2(1)/n, 2 as a racemate in a triclinic spa ce group P (1) over bar. In 1, the two nitro ligands coordinate to cob alt (III) at the trans position of the octahedron. In 2, 3 and 4, the polydentates coordinate to cobalt (III) with their three amino nitroge n atoms on a meridian of the octahedron. In these complexes, the trime thylenediamine rings assume the chair structure and the nitro ligand p lanes are anchored by intermolecular and intramolecular hydrogen bonds to amine protons or to protons of the water of crystallization. (C) 1 997 Elsevier Science Ltd.