Your browser doesn't support javascript.
loading
Alkali Metal Variation and Twisting of the FeNNFe Core in Bridging Diiron Dinitrogen Complexes.
McWilliams, Sean F; Rodgers, Kenton R; Lukat-Rodgers, Gudrun; Mercado, Brandon Q; Grubel, Katarzyna; Holland, Patrick L.
Afiliação
  • McWilliams SF; Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States.
  • Rodgers KR; Department of Chemistry and Biochemistry, North Dakota State University , Fargo, North Dakota 58105, United States.
  • Lukat-Rodgers G; Department of Chemistry and Biochemistry, North Dakota State University , Fargo, North Dakota 58105, United States.
  • Mercado BQ; Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States.
  • Grubel K; Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States.
  • Holland PL; Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520, United States.
Inorg Chem ; 55(6): 2960-8, 2016 Mar 21.
Article em En | MEDLINE | ID: mdl-26925968
ABSTRACT
Alkali metal cations can interact with Fe-N2 complexes, potentially enhancing back-bonding or influencing the geometry of the iron atom. These influences are relevant to large-scale N2 reduction by iron, such as in the FeMoco of nitrogenase and the alkali-promoted Haber-Bosch process. However, to our knowledge there have been no systematic studies of a large range of alkali metals regarding their influence on transition metal-dinitrogen complexes. In this work, we varied the alkali metal in [alkali cation]2[LFeNNFeL] complexes (L = bulky ß-diketiminate ligand) through the size range from Na(+) to K(+), Rb(+), and Cs(+). The FeNNFe cores have similar Fe-N and N-N distances and N-N stretching frequencies despite the drastic change in alkali metal cation size. The two diketiminates twist relative to one another, with larger dihedral angles accommodating the larger cations. In order to explain why the twisting has so little influence on the core, we performed density functional theory calculations on a simplified LFeNNFeL model, which show that the two metals surprisingly do not compete for back-bonding to the same π* orbital of N2, even when the ligand planes are parallel. This diiron system can tolerate distortion of the ligand planes through compensating orbital energy changes, and thus, a range of ligand orientations can give very similar energies.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Metais Alcalinos Idioma: En Revista: Inorg Chem Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Estados Unidos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Metais Alcalinos Idioma: En Revista: Inorg Chem Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Estados Unidos