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metal-organic compounds
In the structure of (1,3-CH3O–C6H4–NH3)H2AsO4, the H2AsO4− and (1,3-CH3O–C6H4–NH3)+ entities alternate in layers perpendicular to the a axis. These organic and inorganic layers are held together in the crystal by N-HO hydrogen bonds. The H2AsO4− groups are connected by hydrogen bonds to form pairs, with internal short AsAs distance of 4.5 Å.