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作 者:刘海洋[1] 李立[1] 应晓[2] 王湘利[1] 徐志广[3] 廖世军[1] 张启光[4]
机构地区:[1]华南理工大学化学系,广州510641 [2]华南理工大学应用物理系,广州510641 [3]华南师范大学化学与环境学院,广州510631 [4]香港科技大学化学系
出 处:《物理化学学报》2008年第9期1602-1608,共7页Acta Physico-Chimica Sinica
基 金:国家自然科学基金(20771039;20673040;N-HKUST604/04)资助项目
摘 要:在6-31G*水平上采用DFT(UB3LYP)方法对锰(III)5,10,15-三(五氟苯基)-corrole[(TPFC)MnIII]及其咪唑轴向配位加合物(TPFC)MnIII(Im)进行了几何结构全优化.计算结果表明,咪唑的配位作用不会改变其基态的高自旋(s=2)特性.(TPFC)MnIII与咪唑配位形成轴向加合物后,其中心金属Mn原子偏离平面结构,与corrole大环N4平均平面的距离达到0.02734nm.NBO分析显示(TPFC)MnIII和(TPFC)MnIII(Im)中心金属锰的电子组态为(dxz)1(dyz)1(dz2)1(dx2-y2)1(dxy)0.(TPFC)MnIII(Im)前线分子轨道能级明显上升,从其β-(LUMO+3)轨道可见咪唑配位N原子的py轨道与中心金属Mn原子dyz轨道形成了d-pπ轨道.TD-DFT计算发现,(TPFC)MnIII和(TPFC)MnIII(Im)电子光谱Q带的"四轨"特征比B带明显;(TPFC)MnIII的CT带主要源自β-(HOMO-1)→β-(LUMO+5)和β-HOMO→β-(LUMO+4)的跃迁,(TPFC)MnIII(Im)的CT带则主要源自β-(HOMO-1)→β-(LUMO+3)和β-HOMO→β-(LUMO+4)的跃迁.Geometries of manganese (Ⅲ) 5,10,15-tris(pentafluorophenyl) corrole (TPFC)Mn^Ⅲ and its imidazole axial binding adduct (TPFC)Mn^Ⅲ(Im) were optimized by using DFT(UB3LYP) method at 6-31G^ * basis set level. Calculation results indicated that (TPFC)Mn^Ⅲ and (TPFC)Mn^Ⅲ(Im) had the same spin state (s=2) in their ground states. (TPFC) Mn^Ⅲ had a plane structure, while Mn atom in (rPFC)Mn^Ⅲ(Im) was above the corrole N4 mean plane 0.02734 nm. NBO analysis showed that the electronic configuration of central Mn atom in (TPFC)Mn^Ⅲ and (TPFC)Mn^Ⅲ(Im) was (dxz)^1(dyz)^1(dz2)^1(dx2-y2)^1(dxy)^0. The energies of frontier orbitals of (TPFC)Mn^Ⅲ(Im) were significantly higher than those of (TPFC)Mn^Ⅲ, and the Mn-imidazole d-pπ bonding could be found from β-(LUMO+3) obital of (TPFC)Mn^Ⅲ(Im). In addition, electronic spectra of (TPFC)Mn^Ⅲ and (TPFC)Mn^Ⅲ(Im) were calculated by using TD-UB3LYP/6-31G^* method, and it could be found that Q band had more "four-orbital" characters than B band. CT band of (TPFC)Mn^Ⅲ was mainly contributed from β-(HOMO- 1) to β-(LUMO+5) and β-HOMO to β-(LUMO+4) transitions, and CT band of (TPFC)Mn^Ⅲ(Im) was mainly contributed from β-(HOMO-1) to β-(LUMO+3) and β-HOMO to β-(LUMO+4) transitions.
关 键 词:锰(Ⅲ)corrole 轴向配体 咪唑 DFT 电子光谱
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