Ambidentate Thiocyanate and Cyanate Ligands in Dinitrosyl Iron Complexes
详细信息 查看全文
- 作者：Chung-Hung Hsieh ; Scott M. Brothers ; Joseph H. Reibenspies ; Michael B. Hall ; Codrina V. Popescu ; Marcetta Y. Darensbourg
- 刊名：Inorganic Chemistry
- 出版年：2013
- 出版时间：February 18, 2013
- 年：2013
- 卷：52
- 期：4
- 页码：2119-2124
- 全文大小：335K
- 年卷期：v.52,no.4(February 18, 2013)
- ISSN：1520-510X
文摘
To explore the effect of delocalization in the Fe(NO)2 unit on possible linkage isomerism of ambidentate ECN鈥?/sup> ligands, E = S and O, anionic DNICs, dinitrosyl iron complexes, (SCN)2Fe(NO)2鈥?/sup> (1) and (OCN)2Fe(NO)2鈥?/sup> (2) were synthesized by the reaction of in situ-generated [Fe(CO)2(NO)2]+ and PPN+ECN鈥?/sup>. Other {Fe(NO)2}9 (Enemark鈥揊eltham notation) complexes, (N3)2Fe(NO)2鈥?/sup> and (PhS)2Fe(NO)2鈥?/sup>, were prepared for comparison. The X-ray diffraction analysis of 1 and 2 yielded the typical tetrahedral structures of DNICs with two slightly bent Fe鈥揘鈥揙 oriented toward each other, and linear FeNCE units. The 谓(NO) IR values shift to lower values for 1 > 2 > (N3)2Fe(NO)2鈥?/sup> > (PhS)2Fe(NO)2鈥?/sup>, reflecting the increasing donor ability of the ancillary ligands and consistent with the redox potentials of the complexes, and the small trends in M枚ssbauer isomer shifts. Computational studies corroborate that the {Fe(NO)2}9 motif prefers N-bound rather than E-bound isomers. The calculated energy differences between the linkage isomers of 1 (Fe-NCS preferred over Fe-SCN by about 6 kcal/mol) are smaller than those of 2 (Fe-NCO preferred over Fe-OCN by about 16 kcal/mol), a difference that is justified by the frontier molecular orbitals of the ligands themselves.