摘要:
Salicylideneaniline (SA) or benzylideneaniline (BA) derivatives with [CpCo(dithiolene)] backbone, which are formulated as [CpCo(S2C2(H)(R))] (R = 5-chlorosalicylideneaniline (2a), salicylideneaniline (2b), benzylideneaniline (2c) and 3,5-di-t-butylsalicylideneaniline (2d)), were prepared from the aniline precursor [CpCo(S2C2(H)(C6H4-NH2))] (1) and the corresponding aldehydes. 1 and 2a-2d were identified with spectral data and electrochemical redox potentials. 1 and 2a-2c were structurally determined by X-ray diffraction studies. 1 and 2a showed dithiolene-H center dot center dot center dot X hydrogen bondings (X = N (1), O (2a)), because the dithiolene proton is usually acidic (ca. 9 ppm by H-1 NMR). In 2a-2c, the dihedral angles between two benzene rings (0(1)) in the SA (or BA) moieties were depending on the substituents on these benzene rings. 2a has small 0(1) angle (7.321 degrees) and the result indicates a short intramolecular OH center dot center dot center dot N hydrogen bonding distance (1.743 angstrom). In the crystal of 2b (or 2c), there are two (or four) crystallographically independent molecules, and their 0(1) angles are different by the flexible SA (or BA) unit. The crystal 2b contains a non-planar molecule (0(1) = 37.043) and a relatively planar molecule (0(1) = 22.822 degrees) as well. (C) 2011 Elsevier B.V. All rights reserved.