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New biscarboxylato zwitterionic ligands, namely bis(N-carboxylatoethyl)-4,4
-dipyridinum) L1 and bis(Ncarboxylatopropyl)-)-4,4
-dipyridinum) L2, were synthesized from the reaction of 4,4
-dipyridine with
3-bromopropanoic acid and 4-bromobutanoic acid, respectively. The reaction of these ligands and the
azido coligand with some metal ions resulted in the formation of polymeric complexes of general formulae [Cr2(Ln)(N3)4]Cl2·H2O and [M2(Ln)(N3)4] xH2O, where (M = Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II) and
Cd(II); n = 1, 2; x = 1, 1, 1, 1, 0, 1, and 1, respectively.) The oxygens of the carboxylato group are coordinated
to the metal ion in a bidentate fashion. The mode of bonding and overall geometry of the complexes were
determin
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