Synthesis and characterization of Mo(0) and W(0) complexes of bis(azol-1-yl)methane based bisphosphines

Abstract

Syntheses of bischalcogenides and Mo(0) and W(0) complexes of bis(2-diphenylphosphinoimidazol-1-yl)methane (1), bis(5-diphenylphosphinopyrazol-1-yl)methane (2) and bis(5-diphenylphosphino-1,2,4-triazol-1-yl)methane (3) are described. The reactions of 1-3 with aq. H₂O₂ or elemental sulfur afforded corresponding bis(chalcogenide) derivatives 4-6 and 7, respectively. The reactions of 1-3 with [M(NC₅H₁₁)₂(CO)₄] (M = Mo, W) resulted in the formation of respective chelate complexes, cis-[M(CO)₄{CH₂(1,3-C₃H₂N₂PPh₂)₂}-κ²P,P] (8, M = Mo; 9, M = W), cis-[M(CO)₄{CH₂(1,2-C₃H₂N₂PPh₂)₂}-κ²P,P] (10, M = Mo; 11, M = W) and cis-[M(CO)₄{CH₂(1,2,4-C₂HN₃PPh₂)₂}-κ²P,P] (12, M = Mo; 13, M = W). The molecular structures of 5, 6 and 9 were confirmed by single-crystal X-ray diffraction studies.

Keywords:

• Bisphosphines
• bis(chalcogenide)
• bis(azol-1-yl)methane
• chelate complex
• transition metal
• carbonyl complexes

Acknowledgements

We also thank the Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, for instrumentation facilities, for spectral and analytical data. J.T.M thanks the Louisiana Board of Regents for the purchase of the CCD diffractometer and the Chemistry Department of Tulane University for support of the X-ray laboratory.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

MSB thanks Science and Engineering Research Board for funding this work through grant CRG/2019/000040.