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The crystal structure of [pyda·H][V(pydc)O2], (pyda·H = 2,6-diaminopyridinum), (pydc = 2,6-pyridinedicarboxylate) has been determined by the X-ray diffraction method. This ionic complex crystallizes in the monoclinic system, space group P21/m, with two molecules per unit cell. The unit-cell dimensions are a = 8.1489(11), b = 6.3515(8), c = 13.5190(18)A, β = 91.962(3)°, and V = 699.30(16)A3. The final R value is 0.0389 for 1185 measured reflections. The resulting V(V) complex forms a crystal in which the vanadium atom is at the center of a distorted trigonal bipyramidal arrangement consisting of three donor atoms of the a tridentate ligand of [pydc]2- and two oxygen atoms. There is also one [pyda·H]+ unit as a counter ion. This ionic complex is held together by both ion-pairing and hydrogen-bonding forces.

Crystal Structure of a Five-Coordinate Vanadium(V) Complex, 2,6-Diamino pyridinum 2,6-pyridinedicarboxylatodioxovanadate(V)