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Original Articles

THE PHENOMENON OF CONGLOMERATE CRYSTALLIZATION. PART 42. THE CRYSTALLIZATION MODE AND CONFORMATIONAL AND CONFIGURATIONAL BEHAVIOR OF MER-TRINITRO COBALT TRIAMINES: [MER-Co(NH3)3(NO2)3] (I) AND [MER-Co(DPT)(NO2)3] (II)

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Pages 41-53 | Published online: 23 Sep 2006
 

Abstract

The structure of the fac-[Co(NO2)3(NH3)3] isomer was determined by B. Nuber, H. Siebert, K. Weidenheimer and J. Weiss, Acta Crystal., B35, 1020 (1979). Interestingly, this isomer also crystallizes in the space group P212121 (z = 4), but the volume it occupies is only 782.09 Å3, whereas the mer-isomer occupies a volume of 816.09 Å3. Therefore, there is a difference of 34.81 Å3/4 molecules or a volume difference per molecule, of 8.70 Å3. If all other factors are equal, this would argue that crystals of the fac isomer are thermodynamically more stable since its higher density must be a reflection of its Madelung energy.

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