Emergence of comparable covalency in isostructural cerium(iv)- and uranium(iv)-carbon multiple bonds.

ABSTRACT: We report comparable levels of covalency in cerium- and uranium-carbon multiple bonds in the iso-structural carbene complexes [M(BIPM^TMS)(ODipp)₂] [M = Ce (1), U (2), Th (3); BIPM^TMS = C(PPh₂NSiMe₃)₂; Dipp = C₆H₃-2,6-ⁱPr₂] whereas for M = Th the M[double bond, length as m-dash]C bond interaction is much more ionic. On the basis of single crystal X-ray diffraction, NMR, IR, EPR, and XANES spectroscopies, and SQUID magnetometry complexes 1-3 are confirmed formally as bona fide metal(iv) complexes. In order to avoid the deficiencies of orbital-based theoretical analysis approaches we probed the bonding of 1-3 via analysis of RASSCF- and

SUBMITTER: Gregson M 

PROVIDER: S-EPMC6006499 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature