Several indium borophosphates have been reported recently, including KIn[BP2O8(OH)](I) and NaIn[BP2O8(OH)](H). The latter two compounds were synthesized under mild hydrothermal conditions, and have the same molar ratio (M-I:In:B:P:O:H) in molecular formula but with different structure types. Compound I crystallizes in the triclinic system with space group P (1) over bar (No.2), a=0.52638(4) nm, b=0.84791(5) nm, c=0.81469(9) nm, alpha=91.1741(7)degrees, beta=93.061(7)degrees, gamma=79.823(5)degrees, V=0.3573 nm(3), Z=2; while compound II possesses a monoclinic structure with space group P2(1)/n (No.14) with a=0.5177(1) nm, b=1.6815(3) nm, c=0.7684(2) nm, beta=94.10(3)degrees, V=0.6672(2) nm(3), Z=4. Eight- membered-ring and six-membered-ring are formed by alternating borate, phosphate tetrahedra and In-coordination octahedron sharing corners via common oxygen atoms in compound I and H respectively. The polyhedra in the structure are oriented along certain direction to form alternating layered fragments. These two structure types can be considered as intergrowth structures, which consist of the same layered fragments growing in different orientations. Other structure intergrowth possibilities are also expected in similar systems
