Four layered coordination polymers, namely, [Cd2(fuma)2(phen)2] (1), [Cd2(BDC)2(phen)2]·2DMF (2), [Cd2(NDC)2(phen)2]·0.5H2O (3), and [Cd2(NDC)2(bipy)2]·2DMF (4) have been synthesized under solvo-thermal conditions (fuma = fumaric acid, H2BDC = 1,4-benzenedicarboxylic acid, H2NDC = 1,4-naphthalenedicarboxylic acid, phen = 1,10-phenanthroline, bipy = 2,2′-bipyridine), which are composed of asymmetric/symmetric binuclear Cd2(RCOO)4(phen)2or Cd2(RCOO)4(bipy)2clusters as secondary building units (SBUs) linked by fuma2−, BDC2−, and NDC2−. Owin...