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N_4 Ring as a Square Planar Ligand in Novel MN_4 Species

机译:N_4环作为新型MN_4物种中的方形平面配体

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摘要

Ab initio(MP2)and density functional theory(DFT)methods are used to examine a series of MN_4 compounds,where M is an alkaline-earth cation(Mg~(2+),Ca~(2+),Sr~(2+),Ba~(2+)),and N_4~(2-)is a six-pi-electron ring.All pyramidal structures except MgN_4 are the most energetically favored for all singlet MN_4 systems considered here.For MgN_4,the Cs structure with dicoordinated Mg out of the N_4 ring plane is the most stable of all.Among these systems,the pyramidal CaN_4,SrN_4,BaN_4 and the planar C_S structure containing dicoordinated Ba are stable as singlet molecules due to their significant isomerization or dissociation barriers(21.3-94.1 kcal/mol).Structural,natural bond orbital(NBO),and molecular orbital(MO)analyses indicate that the bonding in the BaN_4 system has a larger covalent character as compared with other MN_4 systems.In addition,substantial d character is found in the bonding of the MN_4(M=Ca~(2+),Sr~(2+),Ba~(2+))species.
机译:从头算(MP2)和密度泛函理论(DFT)方法研究了一系列MN_4化合物,其中M为碱土阳离子(Mg〜(2 +),Ca〜(2 +),Sr〜(2 +),Ba〜(2+))和N_4〜(2-)是一个六π电子环。除了MgN_4以外,所有金字塔结构都是此处考虑的所有单线态MN_4系统最受青睐的元素。对于MgN_4,Cs在N_4环平面内具有Mg配位的Mg结构是最稳定的。在这些系统中,由于CaN_4,SrN_4,BaN_4的锥体结构和包含Di配位的Ba的平面C_S结构由于其显着的异构化或解离障碍而稳定为单线态分子( 21.3-94.1 kcal / mol)。结构,自然键轨道(NBO)和分子轨道(MO)分析表明,与其他MN_4系统相比,BaN_4系统中的键具有更大的共价特征。在MN_4(M = Ca〜(2 +),Sr〜(2 +),Ba〜(2+))种类的键合中发现

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