Structural characterization of zinc and cadmium complexes derived from N-(4-carboxybenzyl)pyridinium: Revisiting the structure of (Cbp)2ZnBr2 and influence of the metal on carboxylate coordination mode
Structural characterization of zinc and cadmium complexes derived from N-(4-carboxybenzyl)pyridinium: Revisiting the structure of (Cbp)2ZnBr2 and influence of the metal on carboxylate coordination mode
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DOI：
10.1016/j.poly.2022.116126
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发表时间：
2022-12-08
期刊：
影响因子：
2.6
通讯作者：
Parkin，Gerard
中科院分区：
文献类型：
--
作者：
Shlian，Daniel G.;Narvaez，Daymieri;Parkin，Gerard
用X射线衍射法测定了以N-（4-羧基苄基）吡啶为配体的锌、镉化合物（Cbp）_2ZnBr_2和（Cbp）_2CdBr_2的分子结构。（Cbp）2 ZnBr 2和（Cbp）2CdBr 2的结构比较表明，锌配合物采用单齿配位，而镉配合物采用异齿配位. Zn-Br [2.4339（8）]和Cd-Br [2.6357（6）]的键长相差0.20雅阁，这与锌和镉的共价半径的差异是一致的（0.22厘）;因此，它表明先前的结构“（Cbp）2 ZnBr 2”，其具有2.635（2）Br的Zn-Br键长，实际上对应于（Cbp）2CdBr 2。
The molecular structures of the zinc and cadmium compounds, (Cbp)2ZnBr2and (Cbp)2CdBr2, which feature a zwitterionic ligand derived fromN-(4-carboxybenzyl)pyridinium, have been determined by using X-ray diffraction. Comparison of the structures of (Cbp)2ZnBr2and (Cbp)2CdBr2demonstrates that whereas the zinc compound adopts unidentate coordination of the carboxylate ligand, the cadmium counterpart exhibits anisobidentate coordination. The Zn–Br [2.4339(8) Å] and Cd–Br [2.6357(6) Å] bond lengths differ by 0.20 Å, which is in accord with the difference in covalent radii of zinc and cadmium (0.22 Å); as such, it suggests that the previous structure of “(Cbp)2ZnBr2”, which possesses a Zn–Br bond length of 2.635(2) Å, actually corresponds to that of (Cbp)2CdBr2.