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On the inverse trans influence. Density functional studies of [MOX5](n-) (M = Pa, n=2; M = U, n=1; M = Np, n=0; X = F, Cl or Br)

O'Grady, E; Kaltsoyannis, N; (2002) On the inverse trans influence. Density functional studies of [MOX5](n-) (M = Pa, n=2; M = U, n=1; M = Np, n=0; X = F, Cl or Br). J CHEM SOC DALTON (6) 1233 - 1239. 10.1039/b109696f.

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Abstract

The geometric and electronic structures of [MOX5](n-) (M = Pa, n = 2; M = U, n = 1; M = Np, n = 0; X = F, Cl or Br) have been investigated using relativistic density functional theory. An inverse trans influence (i.e. in which the An-X-cis distances are longer than the An-X-trans bonds) is found in all cases, and there is good agreement with the experimental structure of [UOCl5](-). The O-An-X-cis angle is in all cases found to be very close to 90degrees, by contrast to analogous transition metal systems in which this angle is between 96degrees and 102degrees, and which display a regular trans influence. Molecular orbital arguments are presented to account for the difference in angle at the metal between the d- and f-block systems, and hence for the difference in their trans influence behaviour. Comparisons are drawn with previous explanations for the inverse trans influence in the title systems. Mayer bond orders are reported, and are used to understand further the metal-ligand interactions.

Type:Article
Title:On the inverse trans influence. Density functional studies of [MOX5](n-) (M = Pa, n=2; M = U, n=1; M = Np, n=0; X = F, Cl or Br)
DOI:10.1039/b109696f
Keywords:ELECTRONIC POPULATION ANALYSIS, MOLECULAR WAVE FUNCTIONS, BOND ORDER, CRYSTAL-STRUCTURE, ACTINYL IONS, CHEMISTRY, VALENCE, LCAO, APPROXIMATION, COMPLEXES
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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