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

Ruslan A. Polunin , Juliya A. Satska , Sergey V. Kolotilov , Vitaly V. Pavlishchuk , Nataliya P. Burkovskaya , Mikhail A. Kiskin , Grigory G. Aleksandrov , Igor L. Eremenko , Olivier Cador (1) , Lahcène Ouahab (1)

1 ISCR - Institut des Sciences Chimiques de Rennes

One-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)]

Domaines: Chimie

Ruslan A. Polunin, Juliya A. Satska, Sergey V. Kolotilov, Vitaly V. Pavlishchuk, Nataliya P. Burkovskaya, et al.. 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. Inorganic Chemistry, 2015, 54 (11), pp.5232-5238. ⟨10.1021/acs.inorgchem.5b00179⟩. ⟨hal-01153427⟩