The following complexes have been prepared; 3,4:9, 10-dibenzo-1,5,8,12-tetra-aza-cyclotetradecane-1,11-dieneato-nickel(II), -cobalt(II) and -copper(II), ( i.e. XXV, XXIX, and XXXIII), and 3,4:9,10-dibenzo-1,5,8,12-tetra-aza-cyclopentadecane-1,11-dieneato-nickel(II), -cobalt(II) and -copper(II), ( i.e. XXVI, XXX, XXXIV), 3,4: 9,10-dibenzo-1,5,8,12-tetra-aza-cyclohexadecane-1,11- dieneato-nickel(II), and -cobalt(II), ( i.e. XXVII and XXXI),1,5,8,12-tetra-aza-3,4:9,10: 13,14-tribenzocyclotetradecane-1,11-dieneato-nickel(II) and -cobalt(II), ( i.e. XXVIII and XXXII). Their physical properties are investigated. The nickel and cobalt compounds are shown to be low spin, tetracoordinate square planar monomers and very reluctant to change their geometry. Various properties of N,N′-ethylenebis-( o-aminobenzylideneiminato) copper(II) are described.