The Crystal and Molecular Structure of the Unstable Facial Isomer of 1,4,7,10,13,16-Hexaazacyclooctadecanecobalt(III) Nitrate Monohydrate, fac-[Co(hexacyclen)](No3)3·H2O
- 1 September 1989
- journal article
- research article
- Published by Taylor & Francis in Journal of Coordination Chemistry
- Vol. 20 (3) , 229-235
- https://doi.org/10.1080/00958978909408164
Abstract
The crystal structure of all-facial-[Co(hexacyclen)](NO3)3·H2 (the geometric isomer which elutes first on cation exchange chromatography) is reported. In the centrosymmetric cation the cobalt(III) atom exists in a slightly distorted octahedron, and the cation has approximate C 3 symmetry. The Co-N distances average 1.997(3) Å and the average chelate angle is 83.6(1)°. In the crystal lattice the complex cations are linked by water molecules of crystallization thereby forming infinite chains and the nitrate groups are associated to both the cation and the water molecule. The compound crystallizes in the monoclinic space group C2/c with unit cell dimensions a = 13.980(4), b = 9.892(2), c = 16.002(6) Å, β = 111.34(4)° and Z = 4. The structure was refined by a full-matrix least-squares procedure to final R = 0.037 for 1183 reflections with I ≥ 2.5 σ(I).Keywords
This publication has 17 references indexed in Scilit:
- NOTE: STRUCTURE OF A COPPER(II) COMPLEX WITH THE MACROCYCLIC LIGAND HEXACYCLENJournal of Coordination Chemistry, 1988
- Co(II) complex with N6-macrocyclic ligand hexacyclenInorganica Chimica Acta, 1987
- Electrochemical and spectroscopic studies on copper(II) complexes of macrocyclic ligands as models for square-pyramidal metal active sites of copper(II) complexes of bleomycin and glutathioneInorganica Chimica Acta, 1983
- Chiral cobalt(III) complexes of symmetrical hexaaza macrocyclesInorganic Chemistry, 1982
- Formation of nickel(III) complexes with n-dentate amine macrocycles (n = 4, 5, 6). ESR and electrochemical studiesInorganic Chemistry, 1981
- Macromonocyclic polyamines as specific receptors for tricarboxylate-cycle anionsJournal of the American Chemical Society, 1981
- Identification of macrocyclic polyamines and macrocyclic dioxopolyamines by thin-layer chromatography, gas chromatography, and electrophoresisAnalytical Chemistry, 1981
- Complexation of the macrocyclic hexa-amine ligand 1,4,7,10,13,16-hexa-azacyclo-octadecane(‘18-azacrown-6’)J. Chem. Soc., Dalton Trans., 1980
- Synthesis and characterization of cobalt(III), copper(II) and nickel(II) complexes of 1,4,7,10,13,16-hexa-azaoctadecane (hexacyclen)Inorganic and Nuclear Chemistry Letters, 1978
- CONFORMATIONAL ANALYSIS AND ISOLATION OF THE ISOMERS OF [Co(hexaen)]3+Chemistry Letters, 1978