Syntheses, Crystal Structures and Properties of the Tetrametaphosphimates M^II₂(PO₂NH)₄ · 8 H₂O with M^II = Mg, Mn, Co and Zn

Abstract

Mg 2 (PO 2 NH) 4 · 8 H 2 O (1), Mn 2 (PO 2 NH) 4 · 8 H 2 O (2), Co 2 (PO 2 NH) 4 · 8 H 2 O (3) and Zn 2 (PO 2 NH) 4 · 8 H 2 O (4) were obtained as microcrystalline powders by combining aqueous solutions of K 4 (PO 2 NH) 4 · 4 H 2 O and MX 2 · y H 2 O (M ϭ Mg, Mn, Co, Zn; X ϭ Cl, NO 3 ). Single crystals were obtained by crystallization in gelatine gels in U-tubes or test-tubes. 2 and 4 were characterized by thermogravimetry and 4 was additionally characterized by temperature dependend in situ powder diffractometry. The structures of 1, 2, 3 and 4 were found to be isotypic and were solved by single-crystal X-ray methods: P 2 1 /c, Z ϭ 2 (1: a ϭ 645