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• W2044805100 endingPage "441" @default.
• W2044805100 startingPage "423" @default.
• W2044805100 abstract "Abstract Binding of two ligands trans to each other by some transition metal complexes may be cooperative [Khoroshun et al., Mol Phys 2002, 100, 523]. Several interesting consequent effects include (i) inverse relationship between bond strength and binding affinity; (ii) smaller coordination barriers to formation of weaker bonds; (iii) enhancement of Lewis acidity with increased number of ligands. We describe a simple model, σ trans promotion effect (TPE), which considers electronic reorganization between two Lewis structures, and predicts the above‐mentioned effects. The applied result of present study is the unified perspective on several facts of heme chemistry. Particularly, we reiterate an important but often overlooked notion, developed previously within the spin pairing model [Drago and Corden, Acc Chem Res 1980, 13, 353], that, in hemoproteins, the proximal histidine and the distal ligand such as O 2 or CO cooperate in promoting electronic reorganization. As a result, depopulation of d orbital upon ligand binding contributes to the phenomenon of hemoglobin cooperativity. The presented density functional (B3LYP) calculations on realistic models, the processes of carbon monoxide binding by Fe(II) porphyrins and dinitrogen binding by triamido/triamidoamine Mo(III) complexes, particularly the evaluation of the coordination barriers due to spin‐state change by location of the minima on seams of crossing, support the TPE model predictions. From a broader theoretical perspective, the present study would hopefully stimulate the development of much needed frameworks and tools for facile comparisons of wave functions and their properties between different geometries, species, and electronic states. Advancement of practical wave function comparisons may yield fresh qualitative perspectives on chemical reactivity, and promote better understanding of related concepts such as electronic reorganization. © 2006 Wiley Periodicals, Inc. J Comput Chem 28: 423–441, 2007" @default.
• W2044805100 created "2016-06-24" @default.
• W2044805100 creator A5012743614 @default.
• W2044805100 creator A5020600412 @default.
• W2044805100 creator A5033749207 @default.
• W2044805100 date "2006-12-01" @default.
• W2044805100 modified "2023-09-30" @default.
• W2044805100 title "Electronic reorganization: Origin of sigma trans promotion effect" @default.
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