Journal article

Publication year: 1992

Pages: 1427-1439

Journal: Australian Journal of Chemistry

Volume number: 45

Issue number: 9

ISSN: 0004-9425

DOI Link: https://doi.org/10.1071/CH9921427

Publisher: CSIRO Publishing

Abstract: 
Colourless single crystals of hitherto unknown CsNa2 [BO3] and RbNa2 [BO3] have been prepared by exchange reactions from intimate mixtures of Li3 [BO3], Na2O, CS2O and Rb2O respectively. The new compounds are isostructural with KNa2 [BO3]. The structure determination from four-circle diffractometer data confirms the orthorhombic space group Pmmn with Z = 2. CsNa2 [BO3]: a = 626.33(4), b = 579.67(4), c = 560.09(5) pm (R = 2.0%, R(w) = 1.8%). RbNa2 [BO3]: a = 613.3(2), b = 568.0(2), c = 554.9(2) pm (R = 6.0%, R(w) = 4.0%). A characteristic feature of the structure is face-sharing of trigonal planar [BO3] groups with distorted anticuboctahedra of [MO12]. The Madelung Part of the Lattice Energy (MAPLE), Effective Coordination Numbers (ECoN), Mean Fictive Ionic Radii (MEFIR) and Charge Distribution (CHARDI) are calculated and compared with results for KNa2 [BO3].

Harvard Citation style: SCHLAGER, M. and HOPPE, R. (1992) PREPARATION AND CRYSTAL-STRUCTURE OF CSNA2 [BO3] AND RBNA2 [BO3], Australian Journal of Chemistry, 45(9), pp. 1427-1439. https://doi.org/10.1071/CH9921427

APA Citation style: SCHLAGER, M., & HOPPE, R. (1992). PREPARATION AND CRYSTAL-STRUCTURE OF CSNA2 [BO3] AND RBNA2 [BO3]. Australian Journal of Chemistry. 45(9), 1427-1439. https://doi.org/10.1071/CH9921427