Solvothermal synthesis and structure of a cubane cobalt cluster with 3,5-dibromo-2-hydroxybenzaldehyde

ABSTRACT

A new cubane cluster [Co₄(dbhb)₄(μ₃-OCH₃)₄(CH₃OH)₄] (1, where Hdbhb is 3,5-dibromo-2-hydroxy-benzaldehyde) has been synthesized by solvothermal method. Complex 1 was characterized by IR spectroscopy, elemental analysis, Raman spectroscopy, and X-ray single-crystal diffraction. 1 is tetranuclear cobalt cluster with a cubane topology, in which the metal ions and the oxygen atoms from the methanol ligands occupy the alternate vertices of the cubane. There is one independent Co(II) ion, assuming a distorted octahedral geometry with cis-angles O–Co–O in the range of 81.3(1)–101.0(2) and Co–O bonds of 2.009(4)–2.212(4) Å from three μ₃-OCH₃, a dichelating dbhb ligand, and one CH₃OH molecule.

KEYWORDS:

• Solvothermal synthesis
• cubane cobalt cluster
• crystal structure
• Raman spectroscopy

Funding

This work is financially supported by the National Nature Science Foundation of China (No. 21161006), the Nature Science Foundation of Guangxi Province of China (No. 2015GXNSFAA139031), Program for the scientific research and technology development plan of Guilin (No.20150133-5), Program of the first session backbone teacher of Guangxi of China, and the Innovation Project of Guangxi Graduate Education (SS201606).