Syntheses, structures and properties of two new neodymium complexes with N-P-acetamidobenzenesulfonyl-glycine acid

Two new neodymium complexes, [Nd-2(abglyH)(6)(2,2'-bipy)(2)(H2O)(2)] center dot 4H(2)O 1 and {[Nd(abglyH)(3)(H2O)(2)] center dot (4,4'-bipy) center dot 7H(2)O}(n) 2 (abglyH(2) = N-P-acetamidobenzenesulfonyl-glycine acid, 2,2'-bipy = 2,2'-bipyridine, 4,4'-bipy = 4,4'-bipyridine), have been synthesized and their structures have been measured by X-ray crystallography. In 1, nine-coordinated Nd(III) ions are bridged by two syn-syn bidentate and two tridentate bridging carboxylate groups from four different abglyH(-) anions to form dinuclear motifs, which are further connected into a 3-D supramolecular framework via hydrogen bonds between the binuclear motifs and the uncoordinated water molecules. In 2, eight-coordinated Nd(III) ions are linked by six carboxylate groups adopting a syn-syn bidentate bridging fashion to form a 1-D inorganic-organic alternating linear chain. These polymeric chains generate microchannels extending along the a direction, and these cavities are occupied by discrete tetradecameric water clusters, which interact with their surroundings and finally furnish the 3-D supramolecular network via hydrogen bonds. At the same time, pi-pi stacking interactions between benzene rings from abglyH(-) anions also play an important role in stabilizing the network.