A Series of Lead(II) Complexes with π−π Stackings: Structural Diversities by Varying the Ligands

Twelve structurally diverse complexes, [Pb 2 (pzp) 2 (adip)(NO 3 ) 2 ] 1, [Pb(pzp)(glu)] 2, [Pb(pzp)(chdc)]·[Pb(pzp)(chdc)]·pzp·H 2 O 3, [Pb 2 (ndc) 2 (pzp) 2 (H 2 O)]·0.5H 2 O 4, [Pb(pzp)(1,3-bdc)(H 2 O) 0.5 ]·H 2 O 5, [Pb(pzp)(1,2-bdc)]·H 2 O 6, [Pb 2 (ptc) 2 (adip)(NO 3 ) 2 ] 7, [Pb(ptc)(glu)] 8, [Pb(ptc)(chdc)] 9, [Pb(ptc)(dpdc)] 2 10, [Pb(ptc)(1,3-bdc)]·2.5H 2 O 11, and [Pb(ptc)(1,4-bdc)]·0.75H 2 O 12, where H 2 adip = adipic acid, H 2 glu = glutaric acid, H 2 chdc = 1,4-cyclohexanedicarboxylic acid, H 2 ndc = 1,4-naphthalenedicarboxylic acid, 1,4-H 2 bdc = benzene-1,4-dicarboxylic acid, H 2 dpdc = 2,2′-diphenyldicarboxylic acid, 1,3-H 2 bdc = benzene-1,3-dicarboxylic acid, 1,2-H 2 bdc = benzene-1,2-dicarboxylic acid, pzp = pyrazino[2,3-f][1,10]phenanthroline, and ptc = 2-phenyl-1 H -1,3,7,8,-tetraaza-cyclopenta[ l ]-phenanthrene, have been hydrothermally synthesized. Compounds 7 and 10 possess dinuclear structures, which are further extended by π−π interactions to form supramolecular layers and chains, respectively. 1 − 6, 8 − 9, and 11 − 12 feature chain structures, which are then stacked by π−π interactions to result in 2D or 3D supramolecular architectures. The structural differences among such complexes show that the organic acids and neutral chelating ligands have important influences on the structures.