[NiEn3]CrO4: Structure, thermal properties, and pseudomorphism

The crystal structure of [NiEn 3 ]CrO 4 (En is ethylendiamine), C 6 H 24 CrN 6 NiO 4 is studied: a = 9.0408(5) Å, c = 9.7466(4) Å, V = 689.92(8) Å 3 , space group P 6 3 / mmc , Z = 2, d x = 1.704 g/cm 3 , Ni–N 2.133(9) Å, ∠N–Ni–N 82.4(5)°. The thermal properties are determined. When it is heated in a hydrogen atmosphere, a mixture of nanocrystalline Ni and Cr 2 O 3 powders with coherent scattering regions of 59 nm and 90 nm respectively is formed. It is demonstrated that thermal decomposition products consist of pseudomorphic particles that inherit the sizes and shapes of initial [NiEn 3 ]CrO 4 single crystals.