Synthesis and characterization five-coordinate molybdenum compounds bearing bi- or tridentate substituted pyrrole ligands: Molecular structures of {Mo(NC6H3Pri2-2,6)2 R[NC4H3(CH2NMe2)-2]}

Jui Hsien Huang, Hsing Jen Chen, Chung Ching Hsieh, Gene Hsiang Lee, Shie Ming Peng

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Reacting [Mo(NC6H3Pri2-2,6)2Cl 2(dme)] with 1 equiv. of Li [NC4H3(CH2NMe2)-2] in diethyl ether at -78°C yields a red crystalline solid of {Mo(NC6H3Pri2-2,6)2Cl [NC4H3(CH2NMe2)-2]} 1 in 86% yield. Alkylation of 1 with RLi in diethyl ether generates {Mo(NC6H3Pri2-2,6)2 R[NC4H3(CH2NMe2)-2]} (2a, R = Me; 2b, R = Bu) in high yield. Similarly, reacting [Mo(NC6H3Pri2-2,6)2Cl 2(dme)] with 1 equiv. of Li[NC4H2(CH2NMe2)2- 2,5] in diethyl ether at -78°C affords dark red crystals of {Mo(NC6H3Pri2-2,6)2Cl [NC4H2(CH2NMe2)2-2,5]} 3 in 92% yield, in which one NMe2 unit of the pyrrole ligand of 3 coordinates to molybdenum whilst the other one dangles outside the coordination sphere. Variable-temperature 1H NMR study of 3 reveals fluxional behavior of the two NMe2 units of the pyrrole ligand. The activation energy of the fluxionality has been determined as ΔG = 10.5 kcal mol-1. Compounds 1, 2a, 2b and 3 have been characterized by NMR spectroscopy and X-ray crystallography.

Original languageEnglish
Pages (from-to)142-148
Number of pages7
JournalInorganica Chimica Acta
Issue number1-2
Publication statusPublished - 2001 Sep 10


All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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