Crystal and molecular structure of [Cu(NO3)2(C8H12N2O2)2]H2O, a structure containing an unusual zwitterion of pyridoxamine and a symmetric nitrate–oxygen bridge

Abstract

A single crystal structure determination of [Cu(NO₃)₂(pm)₂]H₂O has established that copper is chelated to two pyridoxamine (pm) zwitterions through the amino groups and phenolate oxygen atoms, that the protons lost from the phenolic groups have been used to protonate the pyridine ring nitrogen atoms, and that the Cu(pm)₂ units are bridged by a single oxygen atom from one of the nitrate groups.