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Tetranuclear dioxomolybdenum (VI) cluster anion, hydrogen bond interaction with 1,2-di(4-pyridyl)ethylene

Crystal structure and electrochemical measurement

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Abstract

Tetranuclear dioxomolybdenum cluster complex (TMC) [C12H11N2 +]2[Mo4O10(OCH3) 2−6 ]·CH3OH has been synthesized by the reaction of MoO2(acac)2 with 1,2-di(4-pyridyl)ethylene. The cluster core is composed of four molybdenum atoms arranged in the rhombus shape bridged by two oxo ligands, one bridging O, and three methanol molecules. The TMC [C12H11N2 +]2[Mo4O10(OCH3) 2−6 ]·CH3OH is comprised of two moieties of pyridyl cation [C12H11N2 +]2 (1,2-di(4-pyridyl)ethylene) and cluster anion [Mo4O10(OCH3) 2−6 ]. The cluster is stabilized by two intermolecular interactions (hydrogen bond and π–π stacking interactions). The 1D chain is formed as a result of the hydrogen interaction between (1, 2-di(4-pyridyl)ethylene) and [Mo4O10(OCH3) 2−6 ]. Thermogravimetric analysis clearly indicated the thermal stability of the cluster. Electrochemical measurement showed two irreversible reduction processes at scan rates (−1 to −2 V) and an irreversible one-electron oxidation at +0.79 V. Optical absorption measurement shows that the fundamental absorption edge obeys Tauc’s relation for the allowed non-direct transition. Optical band gap (E g) values equal 2.4 eV.

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Acknowledgements

Acknowledgment is made to Prof. Mohamed Hesham, inorganic chemistry, Taif University, for his supporting and his advice and for Dr. Jessica D. Knoll (Prof Karen J. Brewer’s group) for her helping in electrochemical measurements.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Port Said University, Port Said, 42521, Egypt

    Samir Alghool

  2. Department of Chemistry, Faculty of Science, Taif University, Ta’if, 5700, KSA

    Samir Alghool

  3. Department of Chemistry, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061, USA

    Carla Slebodnick

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  1. Samir Alghool
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Alghool, S., Slebodnick, C. Tetranuclear dioxomolybdenum (VI) cluster anion, hydrogen bond interaction with 1,2-di(4-pyridyl)ethylene. J Therm Anal Calorim 124, 847–855 (2016). https://doi.org/10.1007/s10973-015-5211-y

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