期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 1127, 期 -, 页码 549-556出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2016.08.005
关键词
Bismuth(III) complex; Lead(II) complex; Tropolone; Crystal structure; DFT calculations
资金
- Institute of Nuclear Chemistry and Technology
- PL-Grid Infrastructure
Two new metal complexes, [Bi(trop)(2)(Htrop)(CF3SO3)] (1) and [Pb(trop)(2)(Htrop)] (2), have been synthesized by reaction of the respective metal triflates with an excess of tropolone (Htrop) in the concentrated methanol or dimethylsulfoxide solution. In addition, it was found that complex 1 crystallizes through the formation of unstable intermediate methanol solvated tris(tropolonato)bismuth(III) compound. The characteristic behavior of tropolone which coordinates both as the bidentate anion (top(-)) and the monodentate neutral molecule (Htrop) has been revealed in 1 and 2. The crystal structures of studied compounds have been determined by single-crystal X-ray diffraction. The molecular structures of both complexes have been compared with their geometries received from DFT calculations giving a good correlation. The presented compounds show coordination number of metal ion equal to five in 2 and six in 1 and the presence of stereochemically active 6s(2) lone electron pair. The complexes were characterized by FT-IR, NMR and UV-Vis techniques. IR and UV-Vis spectra of 1 and 2 were also simulated by DFT methods. TD-DFT predictions demonstrate the frontier HOMOs and LUMOs cover in the major part the tropolonate and(or) tropolone moieties which gives mainly ligand-to-ligand charge transfer (LLCT) and ligand centered (LC) character to the energy bands above 300 nm. (C) 2016 Elsevier B.V. All rights reserved.
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