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Syntheses and structures of chalcogen-bridged binuclear group 5 and 6 metal complexes
Moulika Bhattacharyya, Rini Prakash, Chandan Nandi, Monojit Ghosal Chowdhury, Beesam Raghavendra,
Published in Springer
2019
Volume: 131
   
Issue: 12
Abstract
Abstract: Syntheses and structural elucidations of a series of chalcogen stabilized binuclear complexes of group 5 and 6 transition metals have been described. Room temperature reaction of [Cp*CrCl]2 (Cp* = η5-C5Me5) with Li[BH3(SePh)] afforded a Se inserted binuclear chromium complex, [(Cp*Cr)2(µ-Se2SePh)2], 1. In an attempt to make the analogous complexes with heavier group 6 metals, reactions of [Cp*MCl4] (M = Mo and W) with Li[BH3(SePh)] were carried out that yielded Se inserted binuclear complexes [(Cp*M)2(µ-Se)2(µ-SePh)2], 2 and 3 (2: M = Mo and 3: M = W) along with known [(Cp*M)2B5H9], 4a–b (4a: M = Mo and 4b: M = W). Similarly, the reactions of [Cp*NbCl4] with Li[BH3(EPh)] (E = S or Se) followed by thermolysis led to the formation of binuclear chalcogen complexes [(Cp*Nb)2(µ-E2)2], 5 and 6 (5: E = S and 6: E = Se) and known [(Cp*Nb)2(B2H6)2], 7. All these complexes have been characterized by 1H and 13C NMR spectroscopy and mass spectrometry. The structural integrity of complexes 1, 3, 5 and 6 was established by the X-ray diffraction studies. The DFT studies further exemplify the bonding interactions present in these complexes, especially the multiple bond character between the metals in 1–3. Graphic abstract: The syntheses and structural characterizations of three chalcogen-bridged bimetallic complexes of group 5 and 6 metals, such as [(Cp*Nb)2(µ-E2)2] (E = S and Se) (right), [(Cp*Cr)2(µ-Se2SePh)2] (centre) and [(Cp*M)2(µ-Se)2(µ-SePh)2], (M = Mo and W) (left) are reported.[Figure not available: see fulltext.] © 2019, Indian Academy of Sciences.
About the journal
JournalData powered by TypesetJournal of Chemical Sciences
PublisherData powered by TypesetSpringer
ISSN09743626
Open AccessYes
Concepts (17)
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    Chromium compounds
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    Mass spectrometry
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    Metal complexes
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    Molybdenum
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    Nuclear magnetic resonance spectroscopy
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    Structural metals
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    Synthesis (chemical)
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    Transition metals
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    13C NMR SPECTROSCOPY
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    BIMETALLIC COMPLEXES
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    Binuclear complexes
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    Bonding interactions
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    Chalcogens
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    Structural characterization
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    STRUCTURAL ELUCIDATION
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    X-ray diffraction studies
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    Selenium compounds