Constructions of Seven Noncovalent-Bonded 3D Supramolecules from Reactions of Zn(II)/Cd(II) with 4-Dimethylaminopyridine and Carboxylic Acids

Seven novel 4-dimethylaminopyridine(dmap)-based metal complexes of [Zn(dmap)(cna)(2)](2) (1) (Hcna = cinnamic acid), [Zn(dmap)(dcpa)(2)](2) (2) (Hdcpa = 2,6-dichlorophenylacetic acid), [Zn(dmap)(mpba)(2)](2) (3) (Hmpba = 3-phenoxybenzoic acid), [Zn(dmap)(bdmba)(2)](2) (4) (Hbdmba = 4-bromo-3,5-dimethoxybenzoic acid), [Cd( damp)(2)(ibfa)(2)(H2O)(2)] (5) (Hibfa = ibuprofen), [Cd(dmap)(2)(H2O)4]center dot(dnba)(2)center dot H2O (6) (Hdnba = 3,5-dinitrobenzoic acid) and [Cd(dmap)(2)(bdmba)(2)(H2O)] (7) have been afforded by the introduction of the carboxylates as the auxiliary ligands and are structurally featured by distinct techniques of EA, IR spectra, TG and SCXRD analysis. The X-ray studies told that these complexes display mononuclear, binuclear to polymeric appearances with tetrahedral/square-pyramidal arrangement at the Zn2+, and octahedral/pentagonal-bipyramidal geometry for the Cd2+. The dmap in 1 - 7 are coordinated only in monodentate fashion with its ring N. The carboxylates coordinated to the metal ions in monodentate, chelating bidentate and bismonodentate bridging modes for 1-5 and 7. The carboxylates at 6 did not coordinated to the Cd and exhibited only as the counter ion to balance the charge. The CH3 center dot center dot center dot O contacts from the N(CH3)(2) of the dmap were built in all compounds, apart from 1 and 6. The pi-associates originating from the aryl kernel of the anions were existed in 2-3 and 6-7. The intricate intra- and intermolecular classical H-bonds, CH center dot center dot center dot C, CH center dot center dot center dot O/CH3 center dot center dot center dot O, CH center dot center dot center dot CH/CH3 center dot center dot center dot CH/CH3 center dot center dot center dot CH3, CH center dot center dot center dot Cl, CH3 center dot center dot center dot Br, Br center dot center dot center dot Br, CH center dot center dot center dot p/CH2 center dot center dot center dot pi/CH3 center dot center dot center dot pi and pi center dot center dot center dot pi associations are elucidated by the X-ray crystallographic investigations, which push the discrete complexes into high-dimensional ordered supramolecular structures. [GRAPHICS] .