Toward molecular rotors: tetra-N-heterocyclic carbene Ag(i)-halide cubane-type clusters
作者:Wesley D. Clark、Ginger E. Tyson、T. Keith Hollis、Henry U. Valle、Edward J. Valente、Allen G. Oliver、Matthew P. Dukes
DOI:10.1039/c3dt32862g
日期:——
1,3-Bis(3′-butylimidazol-1′-yl)benzene diiodide (2a), 1,3-bis(3′-but-3′′-enyl-imidazolium-3′-yl)benzene diiodide (2b), 1,3-bis(3′-pent-4′′-enyl-imidazolium-3′-yl)benzene diiodide (2c), 1,3-bis(4′-butyl-1′,2′,4′-triazolium-1′-yl)benzene diiodide (2d), or 1,3-bis(4′-butyl-1′,2′,4′-triazolium-1′-yl)benzene dibromide (2e) was reacted with Ag2O yielding unprecedented tetra-N-heterocyclic carbene-Ag(I)-X cubane-type clusters. These were characterized by 1H and 13C NMR spectroscopy, ESI-TOF MS, elemental analysis, and X-ray crystallography. Results from VT 13C NMR spectroscopy and cross-over experiments are consistent with intramolecular exchange suggesting that the Ag(I) complexes are molecular rotors.
1,3-双(3′-丁基咪唑-1′-基)苯二碘化物 (2a),1,3-双(3′-丁-3′′-烯基咪唑阳离子-3′-基)苯二碘化物 (2b),1,3-双(3′-庚-4′′-烯基咪唑阳离子-3′-基)苯二碘化物 (2c),1,3-双(4′-丁基-1′,2′,4′-三唑阳离子-1′-基)苯二碘化物 (2d),或1,3-双(4′-丁基-1′,2′,4′-三唑阳离子-1′-基)苯二溴化物 (2e) 与 Ag2O 反应,生成前所未有的四-N-杂环卡宾-银(I)-X 正方体型簇。这些簇通过 1H 和 13C NMR 光谱、ESI-TOF 质谱、元素分析和 X 射线晶体学进行了表征。来自 VT 13C NMR 光谱和交叉实验的结果与分子内交换一致,表明 Ag(I) 复合物是分子转子。