Mechanical vs Electronic Strain: Calculated Configurations of Alkynyl-Pt(II)-Phosphine Macrocycles

Mechanical vs Electronic Strain: Calculated Configurations of Alkynyl-Pt(II)-Phosphine Macrocycles
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机械应变与电子应变:炔基-Pt(II)-膦大环化合物的计算构型

DOI:
10.1021/acs.organomet.9b00872
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发表时间:
2020
期刊:
影响因子:
2.8
通讯作者:
Michl, Josef
Michl, Josef
中科院分区:
化学2区
文献类型:
--
作者:
Buchanan, Eric A.;Michl, Josef

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在密度泛函理论PBE 0/Def 2-TZVPP//PBE 0/Def 2-SVP水平上,对由四个Pt(PR 3)2连接体和四个末端为乙炔基或吡啶基的棒状体组成的大环化合物的几何构型进行了优化计算.对于四个p,p′-双(乙炔基)联苯杆和中性Pt中心的不带电配合物,平面椭圆形全反式异构体的能量比皱褶正方形全顺式异构体低17 kcal/mol。在这种情况下,与Pt原子处的顺式排列相关的电子应变超过与三键弯曲相关的机械应变。对于含有两个联吡啶和两个p′-双(乙炔基)联苯杆的阳离子配合物,每个Pt中心上带有+1电荷,发现具有全顺式Pt中心的褶皱矩形结构的能量比具有全部四个Pt中心的异构体低38 kcal/mol。
Optimized geometries of macrocycles composed of four Pt(PR3)2linkers and four rods terminated with ethynyl or pyridyl moieties have been calculated at the PBE0/Def2-TZVPP//PBE0/Def2-SVP level of density functional theory for all combinations of cis and trans configurations at the Pt centers. For uncharged complexes with fourp,p′-bis(ethynyl)biphenyl rods and neutral Pt centers, the energy of the planar oval-shaped all-trans isomer lies 17 kcal/mol below that of the puckered square-shaped all-cis isomer. In this case, the electronic strain associated with the cis arrangement at the Pt atoms overrules the mechanical strain associated with the bending of triple bonds. For cationic complexes containing two bipyridyl and twop,p′-bis(ethynyl)biphenyl rods, with a +1 charge on each Pt center, a puckered rectangular structure with all-cis Pt centers is found to be 38 kcal/mol lower in energy than the isomer with all four Pt centers trans. The results have been analyzed in terms of three additive factors, referred to as electronic, mechanical, and electrostatic strains.
DOI: 10.1021/ct9001569
发表时间: 2009-09
影响因子: 5.5
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DOI: --
发表时间: 2019
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影响因子: 2.8
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