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Crystals of  M (AsO 3 OH) ( M  = Sr and Ba) were synthesized under hydrothermal conditions; single-crystal X-ray structure investigations were performed. The average structure of Sr(AsO 3 OH) exhibits three crystallographically different hydrogen bonds; two of them are related by -1 symmetry [space group  P -1,  a  = 7.349(2) Å,  b  = 7.057(2) Å,  c  = 7.460(2) Å,  α  = 95.20(3)°,  β  = 104.78(3)°,  γ  = 88.11(3)°,  Z  = 4]. Weak superstructure reflections were detected which are responsible for a larger cell volume [space group  P -1,  a  = 9.038(2) Å,  b  = 11.732(2) Å,  c  = 15.356(3) Å,  α  = 71.66(3)°,  β  = 75.16(3)°,  γ  = 89.11(3)°,  Z  = 16]. All inversion centres restricting the hydrogen bonds are avoided in the super cell. As a result, a completely ordered atomic arrangement is obtained. The arsenate tetrahedra are linked by hydrogen bonds to polar chains with branches in [110] and [110], respectively; they are linked by the Sr atoms. The compounds CaHPO 4  (monetite), CaHAsO 4  (weilite),  α -SrHPO 4  α -NaHSO 4 , and HgHPO 4  have roughly the same arrangements of the  M (= Ca, Sr, Na, Hg) and  X (= P, As, S) atoms; however their hydrogen-bonding schemas are principally different. For the detailed comparison, the non-standard unit cell was chosen for Sr(AsO 3 OH) [space group  F -1,  a  = 14.697(3),  b  = 28.230(5),  c  = 14.920(3) Å,  α  = 95.20(3)°,  β  = 104.78(3)°,  γ  = 88.11(3)°,  Z  = 64]. The structural refinement of Ba(AsO 3 OH) confirmed isotypy with  γ -Sr(PO 3 OH), K(SO 3 OH), and K(SeO 3 OH) [space group  Pbca  a  = 8.581(2),  b  = 9.896(2),  c  = 19.417(4) Å,  Z  = 16]. Sr(AsO 3 OH) and Ba(AsO 3 OH) are characterized by short (strong) hydrogen bonds.

Synthesis and crystal structure of Sr(AsO 3 OH) and Ba(AsO 3 OH): crystal chemistry of related M H X O 4 ( X = As, P, S) compounds