摘要:
The reactions between the copper (11) salts [CuXL]PF6 (L: 2,6-[1-(2,6-d iisopropylphenylimino)ethyl]pyridine) (X = Cl 1, X = Br 2) and LiTCNQ, in a DMF/water mixture, or Et3NH(TCNQ)(2), in acetone, produced the new complexes [CuXL(TCNQ)] (X = Cl 3, X = Br 4). For both compounds, crystallographic studies have clearly evidenced the existence of dimeric complexes [{CuClL}(TCNQ)](2) owing to pi-pi overlap between two adjacent TCNQ(center dot-) radical anions. Compound 1 reacted with Et4N(C10N7) to afford the mononuclear derivative [CuC1L(C10N7)] (5), while its reaction with K2C10N6 produced the dinuclear complex [(CuClL)(2)(C10N6)] (6). The crystal structures of complexes 5 and 6 have been determined by X-ray crystallography. Magnetic studies have revealed that compound 6 displays weak antiferromagnetic interactions between the two metal centres, conversely compounds 3 and 5 exhibit purely paramagnetic behaviours. (c) 2005 Elsevier B.V.. All rights reserved.