Original scientific paper

Correlations Between Effective Crystal Radii and Unit Cell Volume in Tutton Salts

V. Petruševski ; Institute of Chemistry, Faculty of Science, Arhimedova 5, 91000 Skopje, Macedonia
S. Aleksovska ; Institute of Chemistry, Faculty of Science, Arhimedova 5, 91000 Skopje, Macedonia

Abstract

The unit cell volumes of 29 Tutton salts (the general formula of which is M2IMn(XY4)2 • 6H2O) were retrieved from the literature. Assuming that the unit cell volume may be represented by a function of the type: V = a + b R(M+) + c J?(M2 +) + d RQt-Y) + e Ey (R(M+) where R(M2+) are the effective crystal radii of the uni- and divalent cations, respectively, J?(X-Y) is the X-Y distance in the tetrahedral anion and Ey is the Pauling electronegativity of the Y atoms, the multiple linear regression analysis was applied.
The agreement between the observed and the predicted values of V is rather good (adjusted r2 = 0.966), thus allowing to predict the values for effective crystal radii of ions that have not been published so far. In line with this, the Ru-Tutton salts are predicted to be low-spin Ru2+ hexaaquacomplexes.
Some points concerning the possibility of the existence of particular iso- morphs are also discussed.

Keywords

Hrčak ID:

137261

URI

https://hrcak.srce.hr/137261

Publication date:

29.2.1992.

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