Aralkylpolyamine complexes-III: Some thiocyanate and selenocyanate complexes of copper(II), nickel(II) and cobalt(II) with n-benzylethylenediamine and N,N′-dibenzylethylenediamine

Abstract Eight new complexes are reported: [Cu(C 9 H 4 N 2 ) 2 (SCN)2], [Cu(C 9 H 4 N 2 ) 2 (SeCN)]NO 3 , [Ni(C 9 H 14 N 2 ) 2 (NCS)(NO 3 )], [Ni(C 9 H 14 N 2 ) 2 (NCSe)(NO 3 )], [Ni(C 16 H 20 N 2 ) 2 (NCSe) 2 ], [Ni(C 16 H 20 N 2 ) 2 (NCS) 2 ], [Co(C 16 H 20 N 2 ) 2 (NCS) 2 ], and [Co(C 16 H 20 N 2 ) 2 (NCSe) 2 ]. Their structures are deduced from reflectance spectra at room temperature and at liquid nitrogen temperature, visible spectra in solution, i.r. and far i.r. spectra, magnetic susceptibility measurements, and conductivity measurements in DMF. The dibenzylethylenediamine complexes are all octahedral; the benzylethylenediamine complexes are tetragonal; and all of the complexes are high spin. [Cu(C 9 H 14 N 2 ) 2 (SeCN)]NO 3 is the first copper(II) complex that we know of with a bridging SeCN group. A method of distinguishing between N-bonded and S- or Se-bonded SCN or SeCN groups, based on far i.r. spectra, is suggested.