Interaction of In(I) and Tl(I) cations with 2,6-diaryl pyridine ligands: cation encapsulation within a very weakly interacting N/arene host environment.

Interaction of In(I) and Tl(I) cations with 2,6-diaryl pyridine ligands: cation encapsulation within a very weakly interacting N/arene host environment.
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In(I) 和 Tl(I) 阳离子与 2​​,6-二芳基吡啶配体的相互作用:阳离子封装在相互作用非常弱的 N/芳烃主体环境中。

DOI:
10.1021/ic3021386
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发表时间:
2012
影响因子:
4.6
通讯作者:
Mansaray HB
Mansaray HB
中科院分区:
化学2区
文献类型:
--
作者:
Mansaray HB

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本文研究了2,6-二均三甲苯基吡啶与Tl(I)和In(I)阳离子的相互作用,以期开发出易溶于有机介质的分子M(I)化合物。与等排和等电子三联苯系统形成鲜明对比的是,以[(2,6-Mes 2 py)M]+片段为特征的络合物在固态下具有非常弱的金属-配体相互作用,如通过2.45 <$(M = In)和2.64 <$(M = Tl)的M-N距离所揭示的。虽然在这些系统中观察到与芳烃溶剂合物分子的额外弱π相互作用,但相关的2:1复合物[(2,6-Mes 2 py)2 In][BArf 4]的特征是In(I)中心完全被庞大的Mes 2 py供体包裹,甚至更长的In-N距离[2.586(6)和2.662(5)Å]。这些接触比各自的共价半径之和(2.13 μ m)大约0.5 μ m,并提供了有效的“裸”In(I)阳离子通过轨道相互作用稳定到较小程度的证据。
The interaction of 2,6-dimesitylpyridine with Tl(I) and In(I) cations has been investigated with a view to developing tractable molecular M(I) compounds which are soluble in organic media. In stark contrast to isosteric and isoelectronic terphenyl systems, complexes featuring the [(2,6-Mes2py)M]+fragment feature very weak metal–ligand interactions in the solid state, as revealed by M-N distances of the order of 2.45 Å (M = In) and 2.64 Å (M = Tl). While additional weak π interactions are observed with arene solvate molecules in these systems, the related 2:1 complex [(2,6-Mes2py)2In][BArf4] features an In(I) center wholly encapsulated by the bulky Mes2py donors, and even longer In–N distances [2.586(6) and 2.662(5) Å]. These contacts are about 0.5 Å greater than the sum of the respective covalent radii (2.13 Å) and provide evidence for an effectively “naked” In(I) cation stabilized to a minor extent by orbital interactions.
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