Synthesis of a novel chromium-phosphate built up with unprecedented [CR9P12O58H12]17− clusters under hydrothermal conditions

A new chromium-phosphate has been prepared under hydrothermal conditions for the first time. It crystallizes in the Monoclinic system, space group C2/c, a=17.002(3) Å, b=26.333(5) Å, c=16.017(4) Å, β=96.63 (3)°, V=7123.07(2) Å3 and Z=4. The crystal structure displays a centrosymmetric complex aggregate [Cr9P12O58H12]17−, constructed from the unprecedented enneanucleus chromic core Cr9O10 with peripheral ligations provided by 12 phosphate groups. The sodium ions and water as guests fill in the cavities among the clusters to satisfy the charge balance and keep the structural stability. The magnetic measurement indicates the existence of antiferromagnetic interactions.

Polyhedral representation of the oxo-chromium core in compound 1, showing the bridging function of phosphate groups around the octahedral chromium core (CrO6 octahedron, grey and transparent; Cr, green sphere; P, pink sphere; O, red sphere; H, small black sphere).Figure optionsDownload as PowerPoint slide