On the preference for the sym–fac isomer in the [Co(N,N′-bis(2-aminomethyl)amine)(2,2′-bipyridine)Cl]2+ system
摘要:
The sym -fac isomer of [Co(bpma)(bipy)Cl](2+) is the only one synthesised for this system where, in principle, four exist (bpma = N,N'-bis(2-aminomethyl)amine, bipy = 2,2'-bispyridine). This observation is supported by ab initio energy calculations which reveal this to be the most stable form, and the unsym -fac isomer the highest in energy. It is one of only two cobalt(III) complexes known that contain a single NH centre trans to Cl-. The structure is deduced from the C-13 NMR spectrum and 2D NMR techniques and confirmed by the X-ray crystal structure determination. The agreement between the single crystal data and the calculated ab initio molecular parameters is excellent (within +/-3%). (C) 2002 Elsevier Science Ltd. All rights reserved.
On the preference for the sym–fac isomer in the [Co(N,N′-bis(2-aminomethyl)amine)(2,2′-bipyridine)Cl]2+ system
摘要:
The sym -fac isomer of [Co(bpma)(bipy)Cl](2+) is the only one synthesised for this system where, in principle, four exist (bpma = N,N'-bis(2-aminomethyl)amine, bipy = 2,2'-bispyridine). This observation is supported by ab initio energy calculations which reveal this to be the most stable form, and the unsym -fac isomer the highest in energy. It is one of only two cobalt(III) complexes known that contain a single NH centre trans to Cl-. The structure is deduced from the C-13 NMR spectrum and 2D NMR techniques and confirmed by the X-ray crystal structure determination. The agreement between the single crystal data and the calculated ab initio molecular parameters is excellent (within +/-3%). (C) 2002 Elsevier Science Ltd. All rights reserved.