Oxovanadium (IV) complexes of bidentate [N,O] donor Schiff-base ligands: synthesis and mesomorphism
Oxovanadium (IV) complexes of bidentate [N,O] donor Schiff-base ligands: synthesis and mesomorphism
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DOI：
10.1080/01411594.2012.666667
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发表时间：
2012-10
影响因子：
1.6
通讯作者：
C. Bhattacharjee;C. Datta;G. Das;P. Mondal
中科院分区：
文献类型：
--
作者：
C. Bhattacharjee;C. Datta;G. Das;P. Mondal
合成了一系列新的钒氧席夫碱配合物[VO（L）2]，[L = N-（4-n-烷氧基水杨醛亚胺）-4′-十二烷氧基苯胺，n = 6，8，16和18]。通过FT-IR、1H-NMR、13 C-NMR、UV-Vis、FAB-质量和磁化率测量对化合物进行了表征。用偏光显微镜和差示扫描量热法研究了化合物的介晶行为。这些化合物均具有高度热稳定性，表现出近晶介晶性。非电解质性质的配合物被确定通过溶液电导测量。循环伏安法显示VO（V）/VO（IV）电对为准可逆的单电子响应。在λ 970 cm−1处的νV=O伸缩模表明不存在任何分子间V=O ··· V=O相互作用。在BLYP/DNP水平上用DMol 3进行了密度泛函理论研究，以确定能量优化的结构，揭示了钒基配合物的扭曲四方锥几何结构。
A series of new oxovanadium(IV) Schiff-base complexes of the type [VO(L)2], [L = N-(4-n-alkoxysalicylaldimine)-4′-dodecyloxyaniline, n = 6, 8, 16, and 18] have been synthesized. The compounds were characterized by FT-IR, 1H-NMR, 13C-NMR, UV-Vis, FAB-mass, and magnetic susceptibility measurements. The mesomorphic behavior of the compounds was studied by polarized optical microscopy and differential scanning calorimetry. The compounds are all highly thermally stable exhibiting smectic mesomorphism. Non-electrolytic nature of the complexes was ascertained by solution electrical conductance measurements. Cyclic voltammetry revealed a quasireversible single-electron response for VO(V)/VO(IV) couple. A νV=O stretching mode at ∼970 cm−1 indicates absence of any intermolecular V=O ··· V=O interactions. Density functional theory study was carried out using DMol3 at BLYP/DNP level to determine energy optimized structure revealed a distorted square pyramidal geometry for the vanadyl complexes.