Acta Cryst. (2002). E58, o45-o47  [ doi:10.1107/S160053680102102X ]

Ammonium 2,7-dimethyl-5-bora-1,4,6,9-tetroxaspiro[4.4]nonane-3,8-dionate (ammonium borodilactate)

P. A. Angeli Mary, S. Dhanuskodi, S. Thamotharan and V. Parthasarathi

Abstract: In the title compound, NH₄⁺·C₆H₈BO₆^-, the trivalent boron is tetrahedrally bonded to four O atoms of the two lactate ions having a chiral carbon in each. Two of the O atoms are covalently bonded [1.4259  (13)  Å] to the boron, while there is an extended B-O bonds [1.5177  (14)  Å] between the boron and each of the other two O atoms. There are distortions in the tetrahedral angles around boron ranging from 104.47  (5) to 115.35  (15)°. The structure is stabilized by a network of N-HO hydrogen bonds involving the H atoms of the ammonium cation and the O atoms of the borodilactate anion. The UV-vis transmittance window of this non-linear optical crystal is in the range 240-1250  nm.

Online 14 December 2001

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