Journal of Thermal Analysis and Calorimetry

, Volume 124, Issue 2, pp 847–855 | Cite as

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

Crystal structure and electrochemical measurement


Tetranuclear dioxomolybdenum cluster complex (TMC) [C12H11N2 +]2[Mo4O10(OCH3) 6 2− ]·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) 6 2− ]·CH3OH is comprised of two moieties of pyridyl cation [C12H11N2 +]2 (1,2-di(4-pyridyl)ethylene) and cluster anion [Mo4O10(OCH3) 6 2− ]. The cluster is stabilized by two intermolecular interactions (hydrogen bond and ππ stacking interactions). The 1D chain is formed as a result of the hydrogen interaction between (1, 2-di(4-pyridyl)ethylene) and [Mo4O10(OCH3) 6 2− ]. 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.


Molybdenum Cluster Electrochemical measurement Band gap Thermal stability 



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.

Supplementary material

10973_2015_5211_MOESM1_ESM.pdf (808 kb)
Supplementary material 1 (PDF 809 kb)
10973_2015_5211_MOESM2_ESM.pdf (148 kb)
Supplementary material 2 (PDF 147 kb)
10973_2015_5211_MOESM3_ESM.cif (19 kb)
Supplementary material 3 (CIF 19 kb)


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2016

Authors and Affiliations

  1. 1.Department of Chemistry, Faculty of SciencePort Said UniversityPort SaidEgypt
  2. 2.Department of Chemistry, Faculty of ScienceTaif UniversityTa’ifKSA
  3. 3.Department of ChemistryVirginia Polytechnic Institute and State UniversityBlacksburgUSA

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