LCu(μ-X)2CuL compounds: An induced cuprophilic interaction
In: Polyhedron, Jg. 116 (2016-09-01), S. 204-215
Online
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Zugriff:
A trio of dimeric copper(I) complexes of the formula [(Ph3P)Cu(μ-X)2Cu(PPh3)] (X = OC6F5, 1, OC4F9, 2, OCPh(CF3)2, 3) were prepared and characterized by X-ray crystallography, elemental analysis, and NMR spectroscopy (1H, 13C, 19F, 31P), as was the monomeric [(cy3P)Cu(OC4F9)] (cy = cyclohexyl, 4). Solution conductivity studies demonstrate that all three new dinuclear compounds, as well as the known [(Ph3P)Cu(μ-OC4H9)2Cu(PPh3)], 2-H, are neutral species in solution and do not rearrange into ion pairs. The fold angle (β) varies among these four dimers and the Cu(I)⋯Cu(I) distance in the structure of 2, 2.8315(5) A, is cuprophilic. The Cu(I)⋯Cu(I) distances for 1, 2-H, and 3 are 3.0533(5), 2.890(2), and 3.0169(6) A respectively. Density functional theory (DFT) calculations were performed on 1, 2, 3, and 2-H, as well as the hypothetical 1-H, and several related models. Five PMe3 models, 1(Me), 1-H(Me), 2(Me), 2-H(Me), and 3(Me) were also studied as well as five monomers [(Me3P)CuX] 1-mon, 1-H(mon), 2-mon, 2-H(mon), and 3-mon to understand the electronic reasons for folding in this group of compounds. A Natural Energy Decomposition Analysis (NEDA) indicates that electrostatic stabilizations are the dominant factor governing the strength of interaction between monomeric fragments in 1(Me)–3(Me). NBO analysis reveals that 1(Me) and 1-H(Me) do not display any cuprophilic interactions. The folding angle observed in 2(Me), 2-H(Me), and 3(Me), which is correlated with an increased delocalization from the oxygen 2pz lone pairs, brings the metal centers into sufficient propinquity to have weak Cu⋯Cu orbital interactions. Weak luminescence behavior at room-temperature is also consistent with these assignments.
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LCu(μ-X)2CuL compounds: An induced cuprophilic interaction
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Autor/in / Beteiligte Person: | McNeely, James ; Lum, June S. ; Golen, James A. ; Phillips, Val ; Chen, Peter E. ; Doerrer, Linda H. ; Rheingold, Arnold L. ; Gardner, Evan J. |
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Zeitschrift: | Polyhedron, Jg. 116 (2016-09-01), S. 204-215 |
Veröffentlichung: | Elsevier BV, 2016 |
Medientyp: | unknown |
ISSN: | 0277-5387 (print) |
DOI: | 10.1016/j.poly.2016.05.033 |
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