Synthesis and crystal structure of the first organically templated layered indium phosphate [C5H5NH]+[In(HPO4)(H2PO4)2]–

A new templated indium phosphate, prepared as single crystals from a non-aqueous pyridine–butan-2-ol medium, has a unique two-dimensional structure consisting of [In(HPO4)(H2PO4)2]– layers held together by hydrogen bonding to generate cavities in which pyridinium cations reside.