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A series of (H 2 O) 5 Cr(X-pyO) 3+ ions (pyO = pyridine N-oxide, X = H, 3-CH 3 , 4-CH 3 , 4-OCH 3 , 4-NO 2 ) were prepared by the reduction of the corresponding pyridine N-oxide adducts of diperoxochromium(VI) species with acidic ferrous perchlorate. The (H 2 O) 5 Cr(X-pyO) 3+ complexes undergo aquation to yield Cr(H 2 O) 6 3+ and X-pyO according to the rate lawThe values of the rate constants extrapolated to 298 K at 1.0 M ionic strength are: k 0 = 2.80 × 10 -6 s -1 , k -1 =

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