Dioxomolybdenum(VI) Complex with (1-Oxyethylidene)diphosphonic Acid in an Aqueous Medium: Synthesis and Crystal Structure

Abstract

A new complex of hexaammonium bis(1-oxyethylidenediphosphonate)dioxomolybdenum tetrahydrate (NH₄)₆[MoO₂(L)₂] · 4H₂O (I) (H₄L is H₂O₃P–C(OH)(CH₃)–PO₃H₂) is synthesized. Its molecular structure consisting of the complex anion [MoO₂L₂]^6–, six out-of-sphere ammonium cations \({\text{NH}}_{{\text{4}}}^{ + }\), and four water molecules is determined by X-ray diffraction analysis (CIF file CCDC no. 813517). The solubility of complex I is studied. The changes in the IR absorption spectra upon complex formation are discussed.