C–H⋯π interactions in the [Co(N-(2-pyridylmethyl)-1,3-diaminopropane)(2-aminomethylpyridine)Cl]2+ system: syntheses, 2D NMR spectroscopy, X-ray structures and energy minimisations
摘要:
Ten asymmetric isomers exist for [Co(ptma)(ampy)Cl](2+) (ptma = N-(2-pyridylmethyl)-1,3-diaminopropane, ampy = 2-aminomethylpyridine) each involving unsymmetrical triamine and diamine ligands. Two of these, the m3 and m4 forms, have been synthesized, and under a variety of conditions none of the other eight has been observed. As for the related [Co(pema)(ampy)Cl](2+) system, ab initio energy calculations again show that the isomers containing a C-H(...)pi interaction are the more stable forms; the m4 isomer is the most stable. The structures for the two isolated chloro isomers are deduced from the 2D NMR spectra and are confirmed by the X-ray crystal structure determinations. (C) 2003 Elsevier Ltd. All rights reserved.
C–H⋯π interactions in the [Co(N-(2-pyridylmethyl)-1,3-diaminopropane)(2-aminomethylpyridine)Cl]2+ system: syntheses, 2D NMR spectroscopy, X-ray structures and energy minimisations
摘要:
Ten asymmetric isomers exist for [Co(ptma)(ampy)Cl](2+) (ptma = N-(2-pyridylmethyl)-1,3-diaminopropane, ampy = 2-aminomethylpyridine) each involving unsymmetrical triamine and diamine ligands. Two of these, the m3 and m4 forms, have been synthesized, and under a variety of conditions none of the other eight has been observed. As for the related [Co(pema)(ampy)Cl](2+) system, ab initio energy calculations again show that the isomers containing a C-H(...)pi interaction are the more stable forms; the m4 isomer is the most stable. The structures for the two isolated chloro isomers are deduced from the 2D NMR spectra and are confirmed by the X-ray crystal structure determinations. (C) 2003 Elsevier Ltd. All rights reserved.