The preparation of a mixed-ligand cobalt(III) complex of DPPZ and ethylenediamine: Crystal structures of [Co(en)(2)(DPPZ)] (ClO4)(3).0 center dot 5H(2)O, [Co(en)(2)(bpy)] Br(ClO4)(2) and [Co(en)(2)(phen)] Br-3

The complex [Co(en)(2)(DPPZ)] (ClO4)(3) (3) has been synthesized, and the c rystal structures of this complex and those of [Co(en)(2)(bpy)]Br(ClO4)(2) (1) and [Co(en)(2)(phen)]Br-3 (2) have been determined. Crystal data for (1 ): M 614 . 13, monoclinic, space group C2/c (No. 15), a 16 . 7834(16), b 16 . 308(3), c 8 . 3167(15) Angstrom, beta 104 . 932(11)degrees, V 2199 . 4(6 ) Angstrom, F(000) 1240, Z 4, D-c 1 . 855 g cm(-3), mu 2 . 895 cm(-1), Mo K <(alpha)over bar> (graphite monochromatized) radiation, lambda 0 . 71073 An gstrom, T 293(1) K. Crystal data for (2): M 599 . 07, triclinic, space grou p P (1) over bar (No. 2), a 7 . 7113(11), b 10 . 633(2), c 12 . 9884(18) An gstrom, alpha 85 . 745(15), b 78 . 258(11), gamma 74 . 967(16)degrees, V 10 06 . 7(3) Angstrom, F(000) 588, Z 2, D-c 1 . 976 g cm(-3), mu 6 . 819 cm(-1 ), Mo K<(alpha)over bar> (graphite monochromatized) radiation, lambda 0 . 7 1073 Angstrom, T 293(1) K. Crystal data for (3): M 773 . 44, monoclinic, sp ace group P2(1)/c (No. 14), a 20 . 296(2), b 9 . 6197(11), c 15 . 725(2) An gstrom, beta 92 . 850(10)degrees, V 3066 . 4(6) Angstrom, F(000) 1579, Z 4, D-c 1 . 675 g cm(-3), mu 0 . 898 cm(-1), Mo K<(alpha)over bar> (graphite m onochromatized) radiation, lambda 0 . 71073 Angstrom, T 293(1) K. In all th ree complexes the cobalt is in the usual octahedral environment, with the c ations being linked by hydrogen bonds between the amine hydrogens and the a nions into extended structures.