Structures and crystallization behavior of cis-alpha-[Co(trien) (NO2)(2)]center dot ClO4 (I), cis-beta-[Co(trien) (NO2)(2)]Br center dot 2H(2)O (II),and cis-beta-[Co(trien) (NO2)(2)]center dot ClO3 (III)

Structures, conformations, and crystallization behavior of compounds cis-al pha-[Co(trien) (NO2)(2)]. ClO4 (I), cis-beta-[Co(trien) (NO2)(2)]Br . 2H(2) O (II), and cis-beta-[Co(trien)(NO2)(2)] . ClO3 (III) are reported. Compoun d (I) crystallized in space group Pbca, with a = 12.3323(9), b = 13.0265(9) and c = 18.1597(13) Angstrom; compound (II) crystallized in space group Pc a2(1), with a = 8.1844(7), b = 14.7011(14) and c = 12.4875(12) Angstrom, wh ile compound (III) also crystallized in space group Pca2(1), with a = 12.48 97(8), b = 8.8499(6) and c = 12.6500(8) Angstrom. In all three cases, the C o(III) ions were six-coordinated with nitrogens from trien and two nitrates . Inter- and intramolecular hydrogen bonding interactions are discussed to explain the conglomerate versus racemate crystallization behavior adopted b y these three compounds, with comparison of their known analogue compounds of cis-alpha/beta-[Co(trien) (NO2)(2)]X, where X = halide and NO3-. For the cis-beta-[Co(trien)(NO2)(2)](+) cation, the conformation of the cat ion itself determines the intramolecular hydrogen bonding pattern, and the interaction of counteranions can be ignored, while in cis-alpha-[Co(trien)( NO2)(2)] . ClO4, the perchlorate interrupts the intramolecular hydrogen bon ding pattern observed in the halide analog.