TY - JOUR
T1 - Solid state synthesis, spectroscopic and X-ray studies of metal complexes of 2-picolinic acid and vapochromic behavior of [Co(Pic)2(H2O)2]·2H2O
AU - Tella, Adedibu C.
AU - Oladipo, Adetola C.
AU - Adeyemi, Olalere G.
AU - Oluwafemi, Oluwatobi S.
AU - Oguntoye, Stephen O.
AU - Alimi, Lukman O.
AU - Ajayi, Joseph T.
AU - Degni, Sylvestre K.
N1 - Publisher Copyright:
© 2017 Elsevier Masson SAS
PY - 2017/6/1
Y1 - 2017/6/1
N2 - Three compounds, [Cu(Pic)2(H2O)] (1a), [M(Pic)2(H2O)2]·2H2O] (M=Co (2a), Zn (3a), Pic = 2-picolinic acid) were obtained by solvent-free synthesis through grinding of metal acetate salt with 2-picolinic acid. Favorable comparison of solvent-free with solution based method of 1b, 2b and 3b was observed. Good resemblance of identity of compounds obtained through the two methods was confirmed by elemental analysis, spectroscopic techniques (UV-Vis and FTIR), TGA and PXRD. The single crystal diffraction data for [Co(Pic)2(H2O)2]·2H2O obtained from the Cambridge structure database (CSD), its PXRD simulated patterns closely matched that of complex 2a by solvent-free synthesis. Vapochromic behavior of this complex was studied using colour change, FT-IR, TGA, PXRD and solid state UV-visible spectroscopies. This complex generated specific colour which is also evident in the shifting of the vibrational frequencies (νO-H and ν C=O bands). The resulting inclusion compounds have different colours depending on the solvent used. In addition, exposure of the resultant inclusion compounds to ambient environment or heating for a few minutes regenerate the original material without degradation even after exposure/heating cycles as evident from TGA/DTG thermograms.
AB - Three compounds, [Cu(Pic)2(H2O)] (1a), [M(Pic)2(H2O)2]·2H2O] (M=Co (2a), Zn (3a), Pic = 2-picolinic acid) were obtained by solvent-free synthesis through grinding of metal acetate salt with 2-picolinic acid. Favorable comparison of solvent-free with solution based method of 1b, 2b and 3b was observed. Good resemblance of identity of compounds obtained through the two methods was confirmed by elemental analysis, spectroscopic techniques (UV-Vis and FTIR), TGA and PXRD. The single crystal diffraction data for [Co(Pic)2(H2O)2]·2H2O obtained from the Cambridge structure database (CSD), its PXRD simulated patterns closely matched that of complex 2a by solvent-free synthesis. Vapochromic behavior of this complex was studied using colour change, FT-IR, TGA, PXRD and solid state UV-visible spectroscopies. This complex generated specific colour which is also evident in the shifting of the vibrational frequencies (νO-H and ν C=O bands). The resulting inclusion compounds have different colours depending on the solvent used. In addition, exposure of the resultant inclusion compounds to ambient environment or heating for a few minutes regenerate the original material without degradation even after exposure/heating cycles as evident from TGA/DTG thermograms.
KW - 2-Picolinic acid
KW - PXRD
KW - Simulated pattern
KW - Solvent-free synthesis
KW - Vapochromism
UR - http://www.scopus.com/inward/record.url?scp=85017092753&partnerID=8YFLogxK
U2 - 10.1016/j.solidstatesciences.2017.03.017
DO - 10.1016/j.solidstatesciences.2017.03.017
M3 - Article
AN - SCOPUS:85017092753
SN - 1293-2558
VL - 68
SP - 1
EP - 9
JO - Solid State Sciences
JF - Solid State Sciences
ER -