7-CO-ORDINATION IN METAL-COMPLEXES OF QUINQUEDENTATE MACROCYCLIC LIGANDS .7. SYNTHESIS AND PROPERTIES OF SOME MANGANESE(II), IRON(III), IRON(II), ZINC(II), AND CADMIUM(II) COMPLEXES OF AN N3O2 MACROCYCLE AND CRYSTAL AND MOLECULAR-STRUCTURE OF [2,13-DIMETHYL-6,9-DIOXA-3,12,18-TRIAZABICYCLO[12.3.1]OCTADECA-1(18),2,12,14,16-PENTAENE]DI-ISOTHIOCYANATOMANGANESE(II)2