The inflection point of the variation of interionic distance between Sm3+ and Cl− in a methanol and water mixture

Abstract

The stability constants, [31, of the monochloride complex of Sm(llI) have been determined in mixed system of methanol and water at 1.00 mol dm -3 ionic strength using a solvent extraction technique. The values of ~3~ increase with an increase in the mote fraction of methanol (Xs) in the mixed solvent system when 0<_Xs_<0.351. The interionic distance of Sm3+-CI -(dsm.cl) in the mixed solvent system was estimated by applying the Gibbs' free energy derived from L3~ to a Born-type equation. It was determined that an inflection point of the variation in the estimated ds~.cl against X s was present in the vicinity ofX s = 0.054. The inflection point ofdsm_Cl shows a value ofX s between those OfdEu.Cl and dNd.Ct previously obtained by us.

{[SmCl(en)4][In2Te4]}n: an indium telluride with a one-dimensional sinusoidal chain

“…The [SmCl(en) 4 ] 2+ cations of (I) are assembled into a one-dimensional sinusoidal chain by N-HÁ Á ÁCl hydrogen bonds but, importantly, no similar hydrogen bonds exist between the [LaCl(en) 4 ] 2+ cations of (II). The ionic radius of the Sm 3+ ion (1.132 Å ) (Suganuma & Hori, 1999) is smaller than that of the La 3+ ion (1.216 Å ) (Lien et al, 2005). When the chloride ion bonds to the Sm 3+ ion of (I), its bond [2.869 (3) Å ] is shorter than the La-Cl bond in (II) [2.945 (9) Å ], and the electronegativity of the Cl atom in (I) should be higher than that in (II).…”