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The title complex, [Co(NH3)5(N02Im)]Cl2, was prepared by the action of a standard HN03-H2S04 nitrating mixture on Co(NH3)5(ImH)3+. The complex has been characterized by NMR and UV-vis spectroscopy and a single-crystal X-ray structure determination. The pH dependence of the NMR spectra has been determined, and the pXa of the coordinated N02lm is 1.66. Crystal data for [Co(NH3)5(N02Im)]Cl2 is as follows: space group Pljn•, Z = 4; a = 9.434(2), b = 13.679 (3), c = 10.457 (3) A; 0 = 93.65 (2)°; V-1346.7 (5) A3; R = 4.5% for 2135 reflections.

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