NMR Studies on the Conformation of Oxygen-Nitrogen Donor Macro- cycle Containing N-Carboxylmethyl and Its Complexes in Solution

Chem. J. Chinese Universities ›› 1993, Vol. 14 ›› Issue (8): 1043.

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NMR Studies on the Conformation of Oxygen-Nitrogen Donor Macro- cycle Containing N-Carboxylmethyl and Its Complexes in Solution

YAO Tian-Ming, SUN Hong-Zhe, LI Cun, YOU Xiao-Zeng

State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, 210008

Received:1992-10-16 Revised:1993-01-10 Online:1993-08-24 Published:1993-08-24

Abstract

Abstract: The ¹HNMRspectra of 1, 12-diaza-3, 4-: 9, 10-dibenzo-5, 8-dioxacy-clopentadencane-N, N'-diacetic acid (sodium salt) and its complexes in solution are reported.Two sets of three split peaks have been observed in the low temperature NMRspectra of the macrocycle, which is related to the nonequivalence of 1- and 2- protons on the conformation of the macrocyclic ligand.The ¹HNMRspectra of the nickel complex is very similar to those of the zinc complex.This can be interpreted as a low-spin, square plannar molecular structure of the nickel complex.For all of the zinc, nickel and cobalt complexes, the ether oxygen atoms in the macrocyclic ligand do not coordinate to the central metal ion.

Key words: ¹HNMR, Macrocycle, Complex, Conformation

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YAO Tian-Ming, SUN Hong-Zhe, LI Cun, YOU Xiao-Zeng . NMR Studies on the Conformation of Oxygen-Nitrogen Donor Macro- cycle Containing N-Carboxylmethyl and Its Complexes in Solution[J]. Chem. J. Chinese Universities, 1993, 14(8): 1043.

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NMR Studies on the Conformation of Oxygen-Nitrogen Donor Macro- cycle Containing N-Carboxylmethyl and Its Complexes in Solution

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