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Journal Article

Oligomere Tetraeder-Anionen in Borophosphaten: Darstellung und Kristallstrukturen von NaFe[BP2O7(OH)3] und K2Fe2[B2P4O16(OH)2]

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Citation

Boy, I., Cordier, G., Eisenmann, B., & Kniep, R. (1998). Oligomere Tetraeder-Anionen in Borophosphaten: Darstellung und Kristallstrukturen von NaFe[BP2O7(OH)3] und K2Fe2[B2P4O16(OH)2]. Zeitschrift für Naturforschung Section B-A Journal of Chemical Sciences, 53(2), 165-170.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-BE38-A
Abstract
Crystals of the title compounds were grown under hydrothermal conditions. The crystal structures were determined by single crystal data. NaFe[BP2O7(OH)(3)] (monoclinic, C 2/c, a = 1042.0(2), b = 821.5(1), c = 9217(1) pm, beta = 116.60(1)degrees, Z=4): The crystal structure contains isolated anions [BP2O7(OH)(3)](4-), which correspond to trinuclear units PO1/2O3-BO2/2(OH)(2)-PO1/2O2(OH) of corner sharing tetrahedra. Fe3+ is coordinated octahedrally by oxygen, Na+ is 8-fold coordinated by oxygen forming cubes. K2Fe2[B2P4O16(OH)(2)] (triclinic, P (1) over bar, a = 516.7(1), b = 808.9(1), c = 834.0(1) pm, alpha = 87.06(1), beta = 80.21(1), gamma = 86.59(1)degrees, Z = 1): The crystal structure contains isolated anions [B2P4O16(OH)(2)](8-). Four-membered rings of tetrahedra with two additional terminal phosphate groups are formed by condensation of two trinuclear units PO1/2O3-BO3/2(OH)-PO2/2O2. Fe3+ is in an octahedral and K+ in an irregularly 10-fold coordination by oxygen.