摘要:
Reactions of copper(I) halides with a series of thiosemicarbazones, namely, benzaldehyde thiosemicarbazone (R(1)R(2)C=N-NH-C(=S)-NH(2). R(1) = Ph, R(2) = H: Hbtsc), 2-benzoylpyridine thiosemicarbazone (R(1) = Ph, R(2) = py; Hbpytsc), and acetone thiosemicarbazone (R(1) = R(2) = Me; Hactsc), in the presence of PPh(3) has formed dimeric complexes, Viz. sulfur bridged [Cu(2)(mu-S-Hbtsc)(2)Br(2)(PPh(3))(2)]center dot 2H(2)O (1), iodo-bridged [Cu(2)(mu-1)(2)(eta(1)-S-Hbtsc)(2)(PPh(3))(2)] (2). and heterobridged [Cu(2)(mu(3)-S,N(3)-Hactsc)(eta(1)-Br)(mu-Br)(PPh(3))(2)] (3), as well as rnononuclear complexes [CuX(eta(1)-S-Hbpytsc)(PPh(3))(2)]center dot CH(3)CN (X = Br, 4; Cl, 5). Complexes 1, 2, 4 and 5 involve thiosemicarbazone ligands in eta(1)-S bonding mode while in compound 3, ligand acts in N(3), S-chelation-cum-S-bridging mode (mu(3)-S,N(3) mode). The intermolecular interactions such as, N(2)H center dot center dot center dot X, HN(1)H center dot center dot center dot X (X = S, Br, Cl), CH center dot center dot center dot pi interactions lead to 2D networks. All the complexes have been characterized with the help of elemental analyses, IR, (1)H, and (31)P NMR spectroscopy, and single crystal X-ray crystallography. The role of a solvent in alteration of nuclearity and bonding modes of complexes has been highlighted. (C) 2009 Elsevier Ltd. All rights reserved.