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

Abstract

Dihydrochloride of a binucleating ligand, 1,5-diamino-3-pentanol (Hdpl·2HCl) has been synthesized by a new method in a high yield (>70%). 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.

Synthesis, characterisation and catalase-like activity of dimanganese(III) complexes of 1,5-bis(5-X-salicylidenamino)pentan-3-ol (X=nitro and chloro)

“…5-NO 2 -salpentOH and 5-Cl-salpentOH were prepared by Schiff-base condensation of 1,5-diaminopentan-3-ol [44] with the corresponding salicylaldehyde and were isolated by precipitation from the reaction mixture (ethanol), as pure yellow solids. The two ligands were characterized by elemental analyses and 1 H NMR and IR spectroscopy.…”

New dimanganese(III) complexes of pentadentate (N2O3) Schiff base ligands with the [Mn2(μ-OAc)(μ-OR)2]3+ core: Synthesis, characterization and mechanistic studies of H2O2 disproportionation

“…Ligands used in this work.were prepared by Schiff-base condensation of 1,5-diaminopentan-3-ol[20] with 2-hydroxybenzophenone and 2-hydroxy-1-naphtaldehyde, respectively, and were isolated by precipitation from the reaction mixture (ethanol), as pure yellow solids.…”

Structure and Properties of Copper(II), Manganese(III), and Iron(III) Complexes with Potentially Pentaanionic Heptadentate Ligands Including Alkoxido, Amido, and Phenoxido Donors

“…[30] H 5 L 3 : 1,5-Diaminopentan-3-ol dihydrochloride was synthesized according to a reported method. [68] 1,5-Diaminopentan-3-ol was obtained by reaction of its hydrochloride salt (1.720 g, 9 mmol) with potassium tert-butoxide (2.020 g, 18 mmol) in ethanol (30 mL). The KCl precipitate was filtered off, and the filtrate was concentrated under vacuum at about 1/3 of its initial volume.…”

“…The absorption band at 377 nm may be assigned to a charge-transfer from the bridging alkoxido oxygen atom to the copper(II) ion. [68] The dinuclear Mn III complex 2 exhibits a solid-state electronic spectrum typical of a high-spin d 4 electronic configuration. The spectrum is characterized by several absorption bands in the region 347-658 nm.…”