Three succinate-metal coordination polymers have been synthesized and characterized. The structure of Co(dmbpy)(H 2 O) 2 (C 4 H 4 O 4 ) (dmbpy ) 4,4′-dimethyl-2,2′-bipyridine, C 4 H 4 O 4 ) succinate; 1) contains zipperlike chains, which are constructed of Co(II), dmbpy, H 2 O, and bridging succinates. The structure of two isomorphous 2-D compounds, M(dpdo)(H 2 O) 2 (C 4 H 4 O 4 ) (M ) Zn (2) or Mn (3), dpdo ) 4,4′-dipyridyl N,N′-dioxide), consists of grid networks of succinate-metal chains linked by dpdo.

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The title compounds are isomorphous, comprised of neutral monomeric [M(phen)(2)(dca)(2)] [(I): M = Mn, (II): M = Zn; phen is 1,10-phenanthroline, C(12)H(8)N(2); dca is dicyanamide, C(2)N(3)] molecules. In the molecule, the divalent metal ion is in a distorted octahedral coordination environment formed by six N atoms from the phen and dca ligands. The Mn-N [2.144 (2)-2.319 (2) A] and Zn-N [2.075 (2)-2.245 (2) A] distances are in agreement with the difference in size of the two divalent ions.