1. Introduction
Since the discovery of the microporous aluminum phosphates,
the hydrothermal synthesis and structural characterization of
new open-framework solids templated by organic molecules have
attracted considerable attention. In the past several decades, many
metal and nonmetal phosphates with open-framework structures
have been synthesized owing to their rich structural chemistry
and the potential applications in ion exchange, adsorption, separation
and catalysis [1]. Among metal and nonmetal phosphates, indium
phosphates constitute an important family that exhibits a
rich structural and compositional diversity. So far, a small number
of metal indium phosphates have been reported, such as