Synthesis, structural features, antibacterial behaviour and theoretical investigation of two new manganese(III) Schiff base complexes

Research output: Contribution to journalArticlepeer-review

Authors

  • Pranajit Paul
  • Kanti R. N. Bhowmik
  • Subhadip Roy
  • Dibakar Deb
  • Nandita Das
  • And 9 others
  • Maitri Bhattacharjee
  • R. N. Dutta Purkayastha
  • Louise Male
  • Vickie Mckee
  • Raghavaiah Pallepogu
  • Debasis Maiti
  • Antonio Bauza
  • Antonio Fontera
  • Alexander M. Kirillov

Colleges, School and Institutes

External organisations

  • Tripura University
  • Indian Institute of Science Education and Research, Bhopal (IISERB)
  • Dublin City University
  • Dr. Harisingh Gour University
  • University of the Balearic Islands
  • University of Lisbon

Abstract

Two discrete manganese(III) coordination compounds, [Mn(L)(OCN)]2 (1) and [Mn(L′)(H2O)2][dnba]·DMF·H2O (2) bearing in situ generated Schiff base ligands H2L [H2L = N,N′-o-phenylenebis(salicylaldimine)] or H2L′ [H2L′ = N,N′-bis(salicylidene)ethylenediamine], were easily prepared by treating Mn(CH3COO)2·4H2O with salicylaldehyde and o-phenylenediamine (for 1) or ethylenediamine (for 2), and in the presence of supporting cyanate ligands or 3,5-dinitrobenzoate (dnba) counter anions, respectively. The obtained products were isolated as air-stable crystalline solids and were fully characterized by spectroscopic methods, single-crystal X-ray diffraction, topological analysis, as well as theoretical methods. The X-ray diffraction of the compound 1 reveals that the structure is dimeric with phenolic oxygen atom acting as bridge between two symmetrically equivalent Mn(III) atoms. The structure of 2 contains mononuclear cationic [Mn(L′)(H2O)2] units along with a 3,5-dinitrobenzoate anion and crystallization DMF molecule. Structural analysis indicates a distorted octahedral geometry for both complexes. Intermolecular hydrogen bonding and π–π stacking interactions are present in the lattice and play an important role in cohesion of the structures. Topological analysis of the compound 2 reveals a binodal 3,4-connected underlying 2D net with the 3,4L13 topology. Noncovalent interactions were investigated in terms of energies and geometries using theoretical calculations. Fluorescence and antibacterial properties of 1 and 2 were also investigated and discussed.

Details

Original languageEnglish
Pages (from-to)407-416
JournalPolyhedron
Volume151
Early online date26 May 2018
Publication statusPublished - 1 Sep 2018

Keywords

  • manganese, Schiff bases, crystal structures, noncovalent interactions, DFT calculations