SYNTHESIS AND STRUCTURE OF COBALT(III) COMPLEXES OF 14-MEMBERED CIS-N252 AND TRANS-N2S2 DIBENZO MACROCYCLES WITH 2 PENDANT ACETATO GROUPS

The isomeric fourteen membered macrocyclic ligands 6,7,9,15,16,18-hexahydrodibenzo[f,m][1,8]dithia[4,11]diazacyc-lotetradecine-8,17-diacetic acid-0.5-hydrate (H2L3), C22H26N2O4S2 . 0.5 H2O and 6,7,13,15,16,18-hexahydrodibenzo-[e,m][1,4]dithia[8,11]diazacyclotetradecine-14,17-diacetic acid-1.5-hydrate (H2L6), C22H26N2O4S2 . 1.5 H2O with cis- and trans-N2S2 donorsets and two pendant acetato groups form the stable complexes [Co(L3)]ClO4 . 2H2O (1) and [Co(L6)]ClO4 . H2O (2). Co(III) is octahedrally coordinated herein to all six donor centers of the respective ligand. The macrocyclic rings are folded. The metal ions are located outside the macrocyclic cavity. The mean Co-N, Co-O and Co-S distances are 196, 190 and 224 pm, respectively. Crystal data: 1, monoclinic, space group C2/c, a = 3 797.7(9), b = 763.8(3), c = 2 207.0(7) pm, beta = 123.17(2), Z = 8, 3 445 reflections, R(R(w)) = 0.072(0.070); 2, monoclinic, space group C2/c, a = 3 197.1(6), b = 880.4(2), c = 1 890.6(4) pm, beta = 112,19(3)-degrees, Z = 8, 4415 reflections, R(R(w)) = 0.062(0.064).