Structural preferences of quadruply bonded bimetallic complexes. A DFT study of the chelated (α) and bridged (β) isomers in Mo2Cl4(H2P(CH2)(n)PH2)2 (n = 1, 2)

Sophie Blasco, Isabelle Demachy, Yves Jean, Agustí Lledós

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Abstract

The structure of the quadruply bonded Mo2Cl4(H2P(CH2)(n)PH2)2 (n = 1, 2) bimetallic complexes, with two chelating (α isomer) or two bridging (β isomer) diphosphine ligands, is studied by means of DFT calculations with the B3LYP functional. For each complex (1-α, 1-β and 2-α, 2-β, for n = 1 and 2, respectively), full geometry optimization is performed for both the lowest singlet (δ2) and triplet (3δδ*) states. The chelated α isomers (1-α and 2-α) adopt an essentially eclipsed conformation in both the singlet and the triplet states. The 1-β complex is found to be staggered in the triplet state. Three structures are optimized for the 2-β isomer with a chair (2-β(c)), a twist (2-β(t)) or a boat (2-β(b)) conformation of the Mo-P-C-C-P-Mo six-membered rings. The 2-β(c) and 2-β(t) complexes adopt a twisted conformation in both the singlet and the triplet states while the 2-β(b) complex is eclipsed in the singlet state. A singlet ground state is found for all these complexes, the β isomer being more stable than the α isomer by 17.1 and 7.0 kcal mol-1 for n = 1 and n = 2, respectively. These geometrical and energetic results are discussed with respect to available experimental data. (C) 2000 Elsevier Science S.A.
Original languageEnglish
Pages (from-to)837-845
JournalInorganica Chimica Acta
Volume300-302
DOIs
Publication statusPublished - 30 Apr 2000

Keywords

  • Bimetallic complexes
  • DFT calculations
  • Quadruple bonds
  • Structural preferences

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