Cobalt-dinitrogen complexes with weakened N-N bonds.

Cobalt-dinitrogen complexes with weakened N-N bonds.
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DOI:
10.1021/ja808783u
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发表时间:
2009-07-15
影响因子:
15
通讯作者:
Holland PL
Holland PL
中科院分区:
化学1区
文献类型:
--
作者:
Ding K;Pierpont AW;Brennessel WW;Lukat-Rodgers G;Rodgers KR;Cundari TR;Bill E;Holland PL

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报道的钴的N2络合物不具有N-N键的实质性弱化。利用双烯酮亚胺配体增强三配位几何构型,我们合成了几种新型的CoNNCo配合物。在形式上的单价配合物中,钴在削弱N-N键方面比铁差,但在形式上的零价配合物中,钴和铁给出类似的N-N削弱。这种减弱是由于钴与N2的π-背键,阳离子将更多的电子密度拉入N2。这些结果表明,低配位数的三角平面几何结构是足够的动力,甚至使电负性钴削弱N2的N-N键。
Reported N2 complexes of cobalt do not have substantial weakening of the N-N bond. Using diketiminate ligands to enforce three-coordinate geometries, we have synthesized several novel CoNNCo complexes. In formally univalent complexes, cobalt is poorer than iron at weakening the N-N bond, but in formally zerovalent complexes, cobalt and iron give similar N-N weakening. The weakening is due to cobalt-to-N2 π-backbonding, and cations pull more electron density into N2. These results show that the low coordination number of a trigonal-planar geometry is impetus enough to make even the electronegative cobalt weaken the N-N bond of N2.
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