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• W2004518087 abstract "Infrared spectra of K2Cu(SeO4)2·6H2O and (NH4)2Cu(SeO4)2·6H2O containing SO42- guest ions and those of K2Cu(SO4)2·6H2O and K2Cu(SeO4)2·6H2O containing NH4+ guest ions are presented and discussed in the region of the stretching modes ν3 and ν1 of the sulfate ions and in the region of the asymmetric bending modes ν4 of the NH4+ ions. The SO42- ions matrix-isolated in the selenate matrices (∼2 mol%) exhibit three bands for ν3 and one band for ν1 in agreement with the low site symmetry C1 of the SeO42- host anions. The NH4+ guest ions included in the potassium sulfate matrix are characterized also with three site symmetry components of ν4 (C1 site symmetry of the K+ cations). However, the NH4+ guest ions included in the potassium selenate matrix display four bands corresponding to ν4 due probably to some kind of disorder of the ammonium ions. The extent of energetic distortion of the isomorphously included sulfate ions as deduced from the values of Δν3 (site-group splitting) and Δνmax (the difference between the highest and the lowest components of the stretching modes for the sulfate ions) are commented. The spectroscopic experiments reveal that the SO42- guest ions are stronger distorted in (NH4)2Cu(SeO4)2·6H2O than in K2Cu(SeO4)2·6H2O (Δν3 have values of 32 cm−1 in the potassium matrix and 53 cm−1 in the ammonium one; samples containing about 2 mol% sulfate ions, respectively). The formation of hydrogen bonds between the SO42- guest ions and NH4+ host ions increases the electrostatic field strength at the lattice sites where the guest ions are located, thus leading to a larger extent of energetic distortion of the sulfate ions included in (NH4)2Cu(SeO4)2·6H2O. The analysis of the spectra reveals that the band positions of the water librations in the host compounds are slightly affected by the included NH4+ guest ions. The formation of hydrogen bonds between the NH4+ guest ions and the XO42- host ions leads to a decrease in the proton acceptor capabilities of the anions (anti-cooperative or proton acceptor competitive effect) and as a result the hydrogen bonds weaken on going from the neat potassium compounds to mixed crystals K1.8(NH4)0.2Cu(SO4)2·6H2O and K1.8(NH4)0.2Cu(SeO4)2·6H2O (the bands corresponding to water librations are broadened and slightly shifted to lower frequencies)." @default.
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• W2004518087 date "2009-12-01" @default.
• W2004518087 modified "2023-09-26" @default.
• W2004518087 title "Vibrational behavior of matrix-isolated ions in Tutton compounds. II. Infrared spectroscopic study of and ions included in copper sulfates and selenates" @default.
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• W2004518087 doi "https://doi.org/10.1016/j.molstruc.2009.09.023" @default.
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