Hydrothermal synthesis, crystal structure and thermal behaviour of a zincoborophosphate, (H4TETA)1.5[Zn6B6P12O48] · 1.5H2O (TETA = triethylenetetraamine), with a chiral tetrahedral framework (CZP framework type)

By reacting strongly acidic aqueous mixtures of ZnCl2 (or ZnO), H3BO3, H3PO4 and triethylenetetraamine under mild hydrothermal conditions (160 °C, pH < 2) the new zincoborophosphate (H4TETA)1.5[Zn6B6P12O48] · 1.5H2O (1) has been obtained. 1 is the first metalloborophosphate with a zeolite tetrahedral framework (CZP framework type) synthesized in the presence of an organic amine and structurally closely related to a known sodium zincoborophosphate hydrate. The non-framework H4TETA4+ cations and water molecules are trapped in helical channels. Upon heating 1 loses all water molecules in the temperature range from 90 to 290 °C with retention of the framework structure. The framework collapses, however, in the course of decomposition reactions of the organic cations at temperatures above 390 °C. 1 was characterized by single-crystal X-ray crystallography, 11B and 13C MAS NMR and FT-IR spectroscopy, thermogravimetry and variable-temperature powder X-ray diffraction. Crystal data for 1: Hexagonal, space group P6522, Z = 1, a = 9.6685(4) Å, c = 14.8879(6) Å (291 K).