Connecting modes of linking ligands containing different terminal groups (pyridyl-amine or pyridyl-pyridyl): Preparation and structures of {[Cd(L1)2(OH2)2]•(ClO4)2•(C6H6)}∞, {[Cd(L2)2(ClO4)2]•(CH3OH)2)∞, {[Cd(L3)2(OH2)2]•(ClO4)2}∞, and [Cd(L4)2(CH3OH)2(ClO4)2] {(m-py)-CH=N-(CH3)C6H3-C6H3(CH3)-NH2 (m=3 (B) or 4 (L2)); (n-py)-CH=N-(CH3)C6H3C6H3(CH3)-N=CH-(n-py); (n=3 (U) or 4 (L4))}

We prepared four potential linking ligands, [(3-py)-CH=N-(CH3)C6H3-C6H3-(CH3)-NH2, L1], [(4-py)-CH=N-(CH3)C6H3-C6H3(CH3)-NH2, L2], [(3-py)-CH=N-(CH3)C6H3-C6H3(CH3)-N=CH-(3-py), L3], and [(4-py)-CH=N-(CH3)C6H3-C6H3(CH3)-N=CH-(4-py), L4], all of which contain an intervening biphenyl fragment. Whereas ligands L1 and L2 have two types of terminal groups (pyridyl-amine), ligands B and LA have a single type of terminal groups (pyridyi-pyridyl). Ligands L1-L4 reacted with cadmium nitrate to produce ([Cd(L1)(2)(OH2)(2)]center dot(ClO4)(2)center dot(C6H6)}(infinity) (1), {[Cd(L2)(2)(ClO4)(2)]center dot(CH3OH)(2)}(infinity) (2). ([Cd(L3)(2) (OH2)(2)]center dot(ClO4)(2)}(infinity) (3), and [Cd(L4)(2)(CH3OH)(2)(ClO4)(2)] (4), respectively. Whereas compounds 1-3 are 1-dimensional coordination polymers, compound 4 is a discrete molecular species. (C) 2009 Elsevier B.V. All rights reserved.