Facile Synthesis and Vapochromic Studies of Co(II) Complexes Bearing NO and OO Donor Ligands
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Date
2015-12-15
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Abstract
Two Co(II) complexes containing malonic and isonicotinic acids have been prepared by manual
grinding of stoichiometric amounts of the starting materials. Elemental analysis (CHN), IR,
UV-vis spectroscopic techniques, TGA-DTG investigation and X-ray powder diffraction analy sis were used to characterize the two compounds. Isonicotinic acid coordinated to the metal
via the pyridine ring nitrogen and one oxygen atom of the carboxylic group while malonic
acid coordinated via both oxygen atoms of the carboxylate groups indicating bidentate co ordination mode in the two compounds. The compounds were exposed to some volatile
organic compounds (VOCs) containing nitrogen or oxygen donor atoms in the solid state
and their vapochromic behaviours studied using colour changes, FT-IR and solid state UV vis spectroscopies. Heating the samples exposed to the VOCs for a few minutes at 100 °C
regenerates the original material without degradation, even after several heating cycles.
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Keywords
Solvent-free synthesis, Spectroscopic analysis, Sensor, Vapochromic studies