Binuclear complexes of all first row 3d metals (Sc to Zn) with a cyclic N4-tetradentate ligand: metal-metal bond strengths and bond orders

IF 3 3区 化学 Q3 CHEMISTRY, PHYSICAL Computational and Theoretical Chemistry Pub Date : 2024-11-12 DOI:10.1016/j.comptc.2024.114944
Salma Sultana, R.H. Duncan Lyngdoh
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Abstract

Metal-metal (MM) bonds in binuclear complexes M2L2 (L = tetradentate ligand) for the first row transition metals are studied using DFT to design novel complexes which mimic lantern complexes having four bidentate ligands. Two orientations for the ligand array are applied − orthogonal (orth) and lateral (lat). Ground states for all complexes are identified from several low-lying spin states, where each orth isomer is generally lower in energy than the corresponding lat isomer. All the MM bonds are assigned formal bond order (fBO) values through MO analysis and/or electron counting. The M2L2 orth complexes in many ways mimic the geometrical and electronic structure of known tetragonal lantern complexes. The formal shortness ratio (FSR) and the Wiberg index WMM for the MM bond correlate well with the fBO values, validating their use as measures of intrinsic MM bond strength.

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所有第一排 3d 金属(Sc 至 Zn)与环状 N4-十四酸酯配体的双核配合物:金属-金属键强度和键序
利用 DFT 研究了第一排过渡金属的双核配合物 M2L2(L = 四价配体)中的金属-金属(MM)键,从而设计出模仿具有四个双价配体的灯笼配合物的新型配合物。配体阵列有两个方向--正交(orth)和侧向(lat)。所有配合物的基态都是从几个低洼自旋态中确定的,其中每个正交异构体的能量通常低于相应的侧交异构体。通过 MO 分析和/或电子计数,为所有 MM 键分配了形式键序(fBO)值。M2L2 正交配合物在许多方面都模仿了已知四方灯笼配合物的几何和电子结构。MM 键的形式短度比(FSR)和威伯格指数 WMM 与 fBO 值相关性很好,这证明它们可以用来衡量 MM 键的内在强度。
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来源期刊
CiteScore
4.20
自引率
10.70%
发文量
331
审稿时长
31 days
期刊介绍: Computational and Theoretical Chemistry publishes high quality, original reports of significance in computational and theoretical chemistry including those that deal with problems of structure, properties, energetics, weak interactions, reaction mechanisms, catalysis, and reaction rates involving atoms, molecules, clusters, surfaces, and bulk matter.
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