spectroscopic measurements. The solid-state structures of 1–3 and 5 were also elucidated by X-ray diffraction analyses of single crystals. In the compounds the Ni(II) ion has square-planar geometry. The metal centers in the dimers 2 and 3 are bridged by two endocyclic oxygen donor atoms of the carboxylate groups resulting in Ni2O2-four-membered rings. Reaction of [(im2mes)Ni with 2,3-dimethylbutadiene and CO2
具有N-杂环卡宾
配体的单体和二元
镍内酯[(py)(im mes)Ni(CH 2 CH 2 COO)](1),[(im mes)Ni(CH 2 CH 2 COO)] 2(2), [(im t -but)Ni(C(Et)C(Et)-COO)] 2(3),[(im mes)Ni(C(Et)C(Et)-COO)] 2(4),和[(im mes)Ni(CH 2 C(CH 3)C(CH 3)-CH 2 -COO)](5)(im mes:1,3-二甲亚
咪唑-2-亚苄基;IM吨-丁:1,3-二-吨合成和通过研究-butylimidazol -2-亚基)1 H,13 C NMR和IR光谱测量。的固态结构1 - 3和5也通过X射线衍射分析阐明单晶的。在这些化合物中,Ni(II)离子具有正方形平面的几何形状。二聚体2和3中的
金属中心被
羧酸根基团的两个环内氧供体原子桥接,从而产生Ni 2 O 2-四元环。[(im2mes)Ni的反应与2