SCHEDULED MAINTENANCE:
Neutron-diffraction analysis (final R-value 0·025 over 930 independent reflexions) of the crystal structure of calcium bis(dihydrogen arsenate), Ca(H2AsO4)2, strongly indicates that inter-ion oxygen–oxygen separations of 2·436(3) and 2·444(3)Å contain symmetrical hydrogen bonds.
G. Ferraris, D. W. Jones and J. Yerkess, J. Chem. Soc. D, 1971, 1566 DOI: 10.1039/C29710001566
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