MOLYBDENUM(VI) COMPLEX WITH CITRIC-ACID - SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF 1 1 RATIO CITRATE MOLYBDATE K2NA4[(MOO2)(2)O(CIT)(2)]CENTER-DOT-5H(2)O/

Sodium potassium citrate molybdate K2Na4[(MoO2)(2)O(cit)(2)]. 5H(2)O h as been prepared by the reaction of potassium trihydrogen citrate and sodium molybdate. Analysis of the crystal structure reveals that the a nion of the complex contains a bent (MoO2)O(MoO2) core with an Mo-O-Mo angle 142 degrees. Each molybdenum has a distorted octahedral coordin ation and citrate ligands are tridentate to the two molybdenum atoms v ia the deprotonated hydroxy-, alpha- and beta-carboxyl groups. Princip al dimensions are: [Mo=O(t)](av), 1.706(4); [Mo-O(b)](av), 1.899(3); [ Mo-O(hydroxy)](av), 1.944(3); [Mo-O(alpha-carboxy)](av), 2.207(3), and [Mo-O(beta-carboxy)](av), 2.264(3) Angstrom. The IR, H-1 and C-13 NMR spectra are in agreement with this structure. Copyright (C) 1996 Else vier Science Ltd