Synthesis and Characterization of Copper(II) and Nickel(II) Complexes of 1,5-Diamino-3-pentanol and Its Derivatives

Article abstract of DOI:10.1246/bcsj.55.2404

Dihydrochloride of a binulceating ligand, 1,5-diamino-3-pentanol (Hdpl*2HCl) has been synthesized by a new method in a high yield (>70percent).This ligand forms 1:1 complexes with copper(II), Cu(dpl)X(X=BF4, ClO4, NO3, and Cl(H2O)).The cryomagnetic study of the copper complexes has shown that they are binuclear, and a strong antiferromagnetic interaction is operating between two copper ions.The binuclear structure seems to be quite stable even in aqueous solution.The 1:1 complex with nickel(II) was also isolated as tetraphenylborate, which was essentially diamagnetic.A planar binuclear structure similar to the copper complexes was assumed for this complex.Its absorption band at 29.8*10³ cm^-1 (ε=160) was attributed to the charge transfer transition from the bridging oxygen to the nickel similarly to the bands in the 25-29*10³ cm^-1 region usually observed for alkoxo-oxygen bridged binuclear copper(II) complexes.Some 2:1 copper(II)-dpl complexes have also been synthesized and characterized as binuclear complexes. 1,5-Bis(dimethylamino)-3-pentanol has been synthesized, and its 2:1 copper(II) complexes have been isolated.