Cyanooxo molybdenum(IV) complexes with 2-Pyrazinecarbonitrile (cas 19847-12-2) and 2-pyrazinecarboxylate: Crystallographic and spectroscopic studies reveal metal-assisted nitrile hydrolysis

Add time:10/01/2019    Source:sciencedirect.com

The pH-control of a reaction between tetracyanooxomolybdate(IV) and 2-pyrazinecarbonitrile (pcn), in aqueous-ethanolic solution under ambient conditions, affords the Mo(IV) mixed-ligand complex anions [Mo(CN)4O(pcn)]2− (1) or [Mo(CN)4O(Hpca)]2− (2) with a monodentately bound 2-pyrazinecarboxylic acid (Hpca), resulting from metal-assisted organonitrile hydrolysis. The acid undergoes slow rearrangement to a bidentate mode in [Mo(CN)3O(pca)]2− (3), which is confirmed by means of UV–Vis spectroscopy. The nitrile hydrolysis, favored by the basic conditions, has been ascertained by elemental analyses as well as IR, 1H and 13C NMR spectroscopy. The use of Hpca instead of pcn in the synthetic procedure results in the direct formation of [Mo(CN)3O(pca)]2− (3) with the bidentate 2-pyrazinecarboxylate. The coordination versatility of 2-pyrazinecarboxylate toward cyanooxomolybdenum(IV) complexes is demonstrated by the IR and UV–Vis spectroscopy of solids with [Mo(CN)4O(Hpca)]2− and [Mo(CN)3O(pca)]2− ions, and the definitive evidence for the structure of [Mo(CN)3O(pca)]2− is provided by single-crystal X-ray crystallography. The chemical formulations of all the complexes, isolable as [PPh4]+ salts, have been verified with microanalyses, spectroscopic measurements and X-ray crystal structures of 1 and 3.

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