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Reactions of the lightly-stabilized triosmium cluster Os3(CO)83-Ph2PCH(Me)P(Ph)C6H4}(μ-H) with two-electron donor ligands

Research output: Contribution to journalArticle

Jagodish C. Sarker, Saifur Rahman, Shishir Ghosh, Graeme Hogarth, Shariff E. Kabir

Original languageEnglish
Article number114608
JournalPOLYHEDRON
Volume186
DOIs
Published1 Aug 2020

King's Authors

Abstract

Reactions of the lightly-stabilized Os3(CO)83-Ph2PCH(Me)P(Ph)C6H4}(μ-H) (1) with dihydrogen and representative 2-electron donor ligands, PPh3 and P(OMe)3, are described. With PPh3, the phosphine-adduct Os3(CO)8(PPh3){μ3-Ph2PCH(Me)P(Ph)C6H4}(μ-H) (2) is initially formed but this reacts further via three separate pathways: adding a second equivalent of PPh3 to yield Os3(CO)8(PPh3)2{μ-Ph2PCH(Me)PPh2} (5), losing a CO ligand with concomitant phosphine migration to afford Os3(CO)7(PPh3){μ3-Ph2PCH(Me)P(Ph)C6H4}(μ-H) (3) or adding a CO ligand to yield Os3(CO)9(PPh3){μ-Ph2PCH(Me)PPh2} (4). In contrast, reaction with P(OMe)3 leads to the simple stepwise formation of the mono- and bis-phosphite adducts, Os3(CO)8{P(OMe)3}{μ3-Ph2PCH(Me)P(Ph)C6H4}(μ-H) (6) and Os3(CO)8{P(OMe)3}2{μ-Ph2PCH(Me)PPh2} (7), respectively. Addition of dihydrogen to 1 cleanly affords the unsaturated 46-electron cluster Os3(CO)8{μ-Ph2PCH(Me)PPh2}(μ-H)2 (8). All the new clusters have been spectroscopically characterized together with single crystal X-ray diffraction studies of 2, 3 and 8.

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