title: Syntheses and structures of discrete copper(II) and cadmium(II) supramolecular complexes based on 1,4-diacylthiosemicarbazone ligands.
abstract: Thiosemicarbazides and their metal complexes have attracted considerable interest because of their biological activities and their flexibility, which allows the ligands to bend and rotate freely to accommodate the coordination geometries of various metal centres. Discrete copper(II) and cadmium(II) complexes have been prepared by crystallization of N-[2-(2-hydroxybenzoyl)hydrazinecarbonothioyl]propanamide (H3L) with Cu(CH3COO)2 or Cd(NO3)2 in a dimethylformamide/methanol mixed-solvent system at room temperature, affording the complexes di-μ-acetato-bis{μ4-1-[(2-oxidophenyl)carbonyl]-2-(propanamidomethanethioyl)hydrazine-1,2-diido}tetracopper(II) dimethylformamide disolvate, [Cu4(C11H10N3O3S)2(C2H3O2)2]·2C3H7NO, (I), and bis{μ2-[(2-hydroxyphenyl)formamido](propanamidomethanethioyl)azanido}bis[(4,4'-bipyridine)nitratocadmium(II)] dihydrate, [Cd2(C11H12N3O3S)2(NO3)2(C10H8N2)2]·2H2O, (II). Complex (I) consists of four Cu(II) cations, two μ4-bridging trianionic ligands and two μ2-bridging acetate ligands, while complex (II) is composed of two Cd(II) cations, two μ2-bridging monoanionic ligands, two nitrate ligands and two 4,4'-bipyridine ligands. These discrete complexes are connected by hydrogen bonds and van der Waals interactions to form a three-dimensional supramolecular architecture. Compared with (I), the phenolic hydroxy group and hydrazide N atom of the thiosemicarbazide ligand of (II) are not involved in coordination and lead to a binuclear Cd(II) complex. This different coordination mode may be attributed to the larger ionic radius of the Cd(II) ion compared with the Cu(II) ion.
authors: College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, People's Republic of China.
authors: Chen
authors: C
authors: Jiao
authors: College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, People's Republic of China.
authors: Si-Si
authors: SS
authors: Zhang
authors: College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, People's Republic of China.
authors: Zuo-Yin
authors: ZY
authors: Li
authors: College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, People's Republic of China.
authors: Jian-Jun
authors: JJ
authors: Liu
authors: College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, People's Republic of China.
authors: Mei-Jin
authors: MJ
authors: Lin
authors: College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, People's Republic of China.
authors: Chang-Cang
authors: CC
authors: Huang
mesh_terms: D002104:Cadmium / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008024:Ligands; D008958:Models, Molecular; D012663:Semicarbazides / Q000737:chemistry*; D012664:Semicarbazones / Q000737:chemistry*
chemical_list: C000608669:1,4-diacylthiosemicarbazone; D056831:Coordination Complexes; D008024:Ligands; D012663:Semicarbazides; D012664:Semicarbazones; D002104:Cadmium; C005151:thiosemicarbazide; D003300:Copper
keywords: 1,4-diacylthiosemicarbazide; cadmium(II); copper(II); crystal structure; dinuclear complex; magnetic properties; tetranuclear complex