On the anomalous concentration dependence of the inner-sphere hydration number change of aqua lanthanide ions

Raman Study of the Coordination Structure of a Rare Earth−Acetate Complex in Water

“…It is known that the coordination number of Ln 3+ ions in glassy aqueous rare earth chloride (LnCl 3 ) solutions changes from 9 for the light Ln 3+ ions (La 3+ -Sm 3+ ) to 8 for the heavy Ln 3+ ions (Tb 3+ -Ln 3+ ). 5,[10][11][12] A similar change in the coordination number for the Ln 3+ ions in the middle region (Gd 3+ -Ho 3+ or Er 3+ ) of the rare earth series has been observed in alcohol LnCl 3 solutions. 13,14 Therefore, it would also be interesting to determine whether the coordination number of Ln 3+ ions in aqueous carboxylic acid solutions changes.…”

Raman Study of the Coordination Structure of a Rare Earth−Acetate Complex in Water

“…It is known that the coordination number of Ln 3+ ions in glassy aqueous rare earth chloride (LnCl 3 ) solutions changes from 9 for the light Ln 3+ ions (La 3+ -Sm 3+ ) to 8 for the heavy Ln 3+ ions (Tb 3+ -Ln 3+ ). 5,[10][11][12] A similar change in the coordination number for the Ln 3+ ions in the middle region (Gd 3+ -Ho 3+ or Er 3+ ) of the rare earth series has been observed in alcohol LnCl 3 solutions. 13,14 Therefore, it would also be interesting to determine whether the coordination number of Ln 3+ ions in aqueous carboxylic acid solutions changes.…”

The effects of the coexisting anions on the complex formation of rare earth ions with thiocyanate ions in aqueous solution

“…These frequency changes are very interesting because little frequency change was observed in the ν 4 band of nitrato-rare earth complex ions in the Ln(NO 3 ) 3 solution on vitrification [19]. This difference must be attributed to the difference of the coordination manners between SCN − ion and NO 3 − ion: SCN − ion binds to a rare earth ion in a unidentate way while NO 3 − ion coordinates to a rare earth ion in a bidentate way. The latter binding is rigid but the former binding may be amenable to the changes in the first and second coordination spheres.…”

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

“…In contrast, F − , OH − , SO 4 2− , IO 3 − , CO 3 2− and acetate lead to a predominantly inner-sphere character [30]. Finally, an "anomalous" increase in the Eu(III) hydration number with increasing concentration of various salts has been reported from excitation spectroscopy [31] and Raman measurements [32,33] (in the last study, particular interest was focussed on HCl, LiCl and CsCl).…”

Raman Study of the Coordination Structure of a Rare Earth−Acetate Complex in Water

“…It is known that the coordination number of Ln 3+ ions in glassy aqueous rare earth chloride (LnCl 3 ) solutions changes from 9 for the light Ln 3+ ions (La 3+ -Sm 3+ ) to 8 for the heavy Ln 3+ ions (Tb 3+ -Ln 3+ ). 5,[10][11][12] A similar change in the coordination number for the Ln 3+ ions in the middle region (Gd 3+ -Ho 3+ or Er 3+ ) of the rare earth series has been observed in alcohol LnCl 3 solutions. 13,14 Therefore, it would also be interesting to determine whether the coordination number of Ln 3+ ions in aqueous carboxylic acid solutions changes.…”

The effects of the coexisting anions on the complex formation of rare earth ions with thiocyanate ions in aqueous solution

“…These frequency changes are very interesting because little frequency change was observed in the ν 4 band of nitrato-rare earth complex ions in the Ln(NO 3 ) 3 solution on vitrification [19]. This difference must be attributed to the difference of the coordination manners between SCN − ion and NO 3 − ion: SCN − ion binds to a rare earth ion in a unidentate way while NO 3 − ion coordinates to a rare earth ion in a bidentate way. The latter binding is rigid but the former binding may be amenable to the changes in the first and second coordination spheres.…”

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

“…In contrast, F − , OH − , SO 4 2− , IO 3 − , CO 3 2− and acetate lead to a predominantly inner-sphere character [30]. Finally, an "anomalous" increase in the Eu(III) hydration number with increasing concentration of various salts has been reported from excitation spectroscopy [31] and Raman measurements [32,33] (in the last study, particular interest was focussed on HCl, LiCl and CsCl).…”

Raman Study of the Coordination Structure of a Rare Earth−Acetate Complex in Water

“…It is known that the coordination number of Ln 3+ ions in glassy aqueous rare earth chloride (LnCl 3 ) solutions changes from 9 for the light Ln 3+ ions (La 3+ -Sm 3+ ) to 8 for the heavy Ln 3+ ions (Tb 3+ -Ln 3+ ). 5,[10][11][12] A similar change in the coordination number for the Ln 3+ ions in the middle region (Gd 3+ -Ho 3+ or Er 3+ ) of the rare earth series has been observed in alcohol LnCl 3 solutions. 13,14 Therefore, it would also be interesting to determine whether the coordination number of Ln 3+ ions in aqueous carboxylic acid solutions changes.…”

The effects of the coexisting anions on the complex formation of rare earth ions with thiocyanate ions in aqueous solution

“…These frequency changes are very interesting because little frequency change was observed in the ν 4 band of nitrato-rare earth complex ions in the Ln(NO 3 ) 3 solution on vitrification [19]. This difference must be attributed to the difference of the coordination manners between SCN − ion and NO 3 − ion: SCN − ion binds to a rare earth ion in a unidentate way while NO 3 − ion coordinates to a rare earth ion in a bidentate way. The latter binding is rigid but the former binding may be amenable to the changes in the first and second coordination spheres.…”

Photoexcitation of europium(III) in various electrolytes: Dependence of the luminescence lifetime on the type of salts and the ionic strength

“…In contrast, F − , OH − , SO 4 2− , IO 3 − , CO 3 2− and acetate lead to a predominantly inner-sphere character [30]. Finally, an "anomalous" increase in the Eu(III) hydration number with increasing concentration of various salts has been reported from excitation spectroscopy [31] and Raman measurements [32,33] (in the last study, particular interest was focussed on HCl, LiCl and CsCl).…”