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Polymorph of trans-dichlorotetrakis(pyridine-N)ruthenium(II) influenced by a dihydrazone: crystal structure, spectral, Hirshfeld surfaces, antimicrobial, toxicity and in silico docking studies


Many reports describe the influence of additives or impurities on the physicochemical properties of crystals. On having obtained trans-[RuCl2(C5H5N)4] as brown, needle-shaped crystals contrary to red or orange-red blocks reported previously, we herein revisit its study. This complex was obtained from the filtrate of an ensuing reaction mixture of RuCl3·3H2O, bis(2-hydroxy-l-naphthaldehyde)adipoyldihydrazone (npahH4) and pyridine in methanol. Findings from X-ray crystallographic data and spectra of IR, UV-Visible, 1H and 13C NMR along with other analytical studies of the complex are presented here. A comparative study with previously reported crystal forms was performed to understand the accompanying molecular structural differences in the physical (shape, size and color) morphological alteration. Further probing into molecular dynamics, the molecular interactions were analyzed and quantified using computational methods. The symmetry of intermolecular interaction in C—H⋯Cl is different from earlier reported crystal forms. The intercontact H⋯H showed a major contribution (62.9%) for Hirshfeld surfaces. Also, we report antibacterial activity of the complex against methicillin-resistant Staphylococcus aureus followed by the in silico docking study that revealed its interaction with the residue Glu58 of ATPase subunit of S. aureus GyrB. Additional studies on its toxicity using rat models revealed this complex as non-toxic to animals.

Graphic abstract

Synopsis: The crystal and colour morphology of a polymorph of trans-[RuCl2(py)4] have been studied by different investigations. The intercontacts have been discussed. The significant influence of a dihydrazone in morphological changes is revealed. The biological aspects have been further investigated through non-toxicity, antimicrobial screening and molecular docking studies against pathogen S. aureus.

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We are highly indebted to Prof. A T Khan, the Vice-Chancellor of Aliah University, Kolkata and Prof. R A Lal, Department of Chemistry, North-Eastern Hill University, Shillong for their helpful discussions. Thanks are also due to the Head Incharge and Mr. Chandan Buragohain of CIF, IIT-Guwahati, Guwahati for recording NMR spectra. We are thankful to Dr. Pranjal Saikia, Dr. Samiul Haque and Nabajyoti Dhing from Department of Applied Sciences, Gauhati University, Guwahati for their help recording electronic and IR spectra. We thank the Head, USIC, Gauhati University, Guwahati for recording the crystallographic data. M K S thanks IOE and DST PURSE, University of Mysore, Mysuru. P. S. and P. M. are thankful to MHRD, Govt. of India assisted by the World Bank for TEQIP-III project grants.

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BASUMATARY, D., SHANKAR, M.K., BYRAPPA, K. et al. Polymorph of trans-dichlorotetrakis(pyridine-N)ruthenium(II) influenced by a dihydrazone: crystal structure, spectral, Hirshfeld surfaces, antimicrobial, toxicity and in silico docking studies. J Chem Sci 132, 133 (2020).

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  • Crystal-color morphology
  • characterization
  • packing interactions
  • additive