Structural Characterization of Copper (Ⅰ) Complex Based on Triphenylphosphine and Thioalcohol Mixed Ligands

Abstract

Abstract: In this work, a new Cu(I) complex [CuBr(L)(PPh₃)₂]·2CH₃OH (1) was synthesized using triphenylphosphine (PPh₃) and 5-methoxybenzimidazole-2-thiol (L). The complex was characterized by single crystal X-ray diffraction, elemental analysis, thermogravimetric analysis and other various spectroscopic analyses. X-ray crystallographic analysis reveals that complex (1) crystallizes in the monoclinic system with P2₁/c space group. Each central metal ion is four-coordinated with one bromide ion, two phosphorus atoms from two PPh₃ ligands and one sulphur atom from one L ligand, resulting in a mononuclear complex. In addition, the fluorescence spectra of 1 in methanol solution and solid state show that the emission mechanism belongs to metal-to-ligand charge transfer (MLCT) based on PPh₃. The difference of the fluorescence emission maximum of 1 in the methanol solution is not shifted compared to PPh₃, while red-shifted by 6 nm compared to PPh₃ in solid state, indicating that the structure of 1 in methanol solution is different from that in solid state.

Key words: copper(Ⅰ) complex, crystal structure, spectroscopic property, triphenylphosphine, 5-methoxybenzimidazole-2-thiol

CLC Number:

O641.4

YAN Li, PENG Shaochun. Structural Characterization of Copper (Ⅰ) Complex Based on Triphenylphosphine and Thioalcohol Mixed Ligands[J]. Journal of Synthetic Crystals, 2021, 50(8): 1457-1463.

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