Luminescent properties of some imidazole and oxazole based heterocycles: Synthesis, structure and substituent effects
作者:Abiodun O. Eseola、Wen Li、Wen-Hua Sun、Min Zhang、Liwei Xiao、Joseph A.O. Woods
DOI:10.1016/j.dyepig.2010.07.005
日期:2011.3
ridine and 2,4-di-tert-butyl-6-(1H-phenanthro[9,10-d]imidazol-/oxazol-2-yl)phenol derivatives were synthesized and characterized using elemental and spectroscopic analyses as well as single-crystal X-ray diffraction analysis. The oxazole derivatives displayed higher photoluminescence efficiencies than their imidazole analogues. The 2-(phenanthro[9,10-d]oxazole/imidazol-2-yl)pyridine derivatives displayed
一系列的2-R-6-(芳基恶唑-/咪唑-2-基)吡啶和2,4-二叔丁基-6-(1H-菲并[9,10-d]咪唑-/恶唑-2合成并使用元素分析和光谱分析以及单晶X射线衍射分析对(yl)苯酚衍生物进行了表征。恶唑衍生物显示出比其咪唑类似物更高的光致发光效率。2-(菲[9,10-d]恶唑/咪唑-2-基)吡啶衍生物在非极性溶剂中的量子产率接近于1,但在极性溶剂中被淬灭。恶唑类似物在400nm和550nm区域之间产生可逆的荧光光开关,而咪唑类似物在极性溶剂中经历不可逆的光诱导的准分子形成。1个1 H NMR被用来合理化2-(菲并[9,10-d]咪唑-2-基)吡啶衍生物的准分子之间的分子间相互作用的建议模式。
Hemilability of 2-(1H-imidazol-2-yl)pyridine and 2-(oxazol-2-yl)pyridine ligands: Imidazole and oxazole ring Lewis basicity, Ni(II)/Pd(II) complex structures and spectra
作者:Abiodun O. Eseola、Wen Li、Olalere G. Adeyemi、Nelson O. Obi-Egbedi、Joseph A.O. Woods
DOI:10.1016/j.poly.2010.02.039
日期:2010.5
They were also used to study the substituent effects on the donor strengths as well as the coordination chemistries of the imidazole/oxazole fragments of the hemilabile ligands. All the observed protonation–deprotonation processes found within pH 1–14 media pertain to the imidazole or oxazole rings rather than the pyridyl Lewis bases. The donor characteristics of the imidazole/oxazole ring can be estimated
Palladium(II) complexes bearing 2-(1H-imidazol/oxazol-2-yl)-pyridines: Synthesis, structures and ligand effects in Suzuki–Miyaura cross-coupling
作者:Abiodun Omokehinde Eseola、Daniel Geibig、Helmar Görls、Wen-Hua Sun、Xiang Hao、Joseph Anthony Orighomisan Woods、Winfried Plass
DOI:10.1016/j.jorganchem.2013.12.041
日期:2014.3
P212121. All complexes were utilized as pre-catalysts in a comparative study to probe relevant features of the palladium active species during high temperature Suzuki–Miyaura cross-coupling catalysis. Relatively higher catalytic activities were obtained for complexes bearing the bidentate ligands that possess weaker azole donor arms. Results obtained suggest that ligand dissociation steps may be important