Solvent-Induced Change of Electronic Spectra and Magnetic Susceptibility of Co(II) Coordination Polymer with 2,4,6-Tris(4-pyridyl)-1,3,5-triazine

International audienceOne-dimensional coordination polymer [Co(Piv)2(4-ptz)(C2H5OH)2]n (compound 1, Piv(-) = pivalate, 4-ptz = 2,4,6-tris(4-pyridyl)-1,3,5-triazine) was synthesized by interaction of Co(II) pivalate with 4-ptz. Desolvation of 1 led to formation of [Co(Piv)2(4-ptz)]n (compound 2), which adsorbed N2 and H2 at 78 K as a typical microporous sorbent. In contrast, absorption of methanol and ethanol by 2 at 295 K led to structural transformation probably connected with coordination of these alcohols to Co(II). Formation of 2 from 1 was accompanied by change of color of sample from orange to brown and more than 2-fold decrease of molar magnetic susceptibility (χM) in the temperature range from 2 to 300 K. Resolvation of 2 by ethanol or water resulted in restoration of spectral characteristics and χM values almost to the level of that of 1. χMT versus T curves for 1 and samples, obtained by resolvation of 2 by H2O or C2H5OH, were fitted using a model for Co(II) complex with zero-field splitting of this ion.[on SciFinder (R)

Solvent-Induced Change of Electronic Spectra and Magnetic Susceptibility of Co^II Coordination Polymer with 2,4,6-Tris(4-pyridyl)-1,3,5-triazine

One-dimensional coordination polymer [Co­(Piv)₂(4-ptz)­(C₂H₅OH)₂]_<i>n</i> (compound <b>1</b>, Piv^– = pivalate, 4-ptz = 2,4,6-tris­(4-pyridyl)-1,3,5-triazine) was synthesized by interaction of Co^II pivalate with 4-ptz. Desolvation of <b>1</b> led to formation of [Co­(Piv)₂(4-ptz)]<i>_n</i> (compound <b>2</b>), which adsorbed N₂ and H₂ at 78 K as a typical microporous sorbent. In contrast, absorption of methanol and ethanol by <b>2</b> at 295 K led to structural transformation probably connected with coordination of these alcohols to Co^II. Formation of <b>2</b> from <b>1</b> was accompanied by change of color of sample from orange to brown and more than 2-fold decrease of molar magnetic susceptibility (χ_M) in the temperature range from 2 to 300 K. Resolvation of <b>2</b> by ethanol or water resulted in restoration of spectral characteristics and χ_M values almost to the level of that of <b>1</b>. χ_M<i>T</i> versus <i>T</i> curves for <b>1</b> and samples, obtained by resolvation of <b>2</b> by H₂O or C₂H₅OH, were fitted using a model for Co^II complex with zero-field splitting of this ion

Solvent-Induced Change of Electronic Spectra and Magnetic Susceptibility of Co^II Coordination Polymer with 2,4,6-Tris(4-pyridyl)-1,3,5-triazine

One-dimensional coordination polymer [Co­(Piv)₂(4-ptz)­(C₂H₅OH)₂]_<i>n</i> (compound <b>1</b>, Piv^– = pivalate, 4-ptz = 2,4,6-tris­(4-pyridyl)-1,3,5-triazine) was synthesized by interaction of Co^II pivalate with 4-ptz. Desolvation of <b>1</b> led to formation of [Co­(Piv)₂(4-ptz)]<i>_n</i> (compound <b>2</b>), which adsorbed N₂ and H₂ at 78 K as a typical microporous sorbent. In contrast, absorption of methanol and ethanol by <b>2</b> at 295 K led to structural transformation probably connected with coordination of these alcohols to Co^II. Formation of <b>2</b> from <b>1</b> was accompanied by change of color of sample from orange to brown and more than 2-fold decrease of molar magnetic susceptibility (χ_M) in the temperature range from 2 to 300 K. Resolvation of <b>2</b> by ethanol or water resulted in restoration of spectral characteristics and χ_M values almost to the level of that of <b>1</b>. χ_M<i>T</i> versus <i>T</i> curves for <b>1</b> and samples, obtained by resolvation of <b>2</b> by H₂O or C₂H₅OH, were fitted using a model for Co^II complex with zero-field splitting of this ion