Syntheses, structures and electrochemical properties of complexes of nickel(II) with triethylenetetramine and bidentate nitrogen donor co-ligands

Abstract

Three new polyamine Ni(II) complexes, namely [Ni(trien)(phen)](BF 4 ) 2 1, [Ni(trien)(bipy)](ClO 4 ) 2 2 and [Ni(trien)(en)](ClO 4 ) 2 3 [trine = triethylenetetramine, phen = 1,10-phenanthroline, bipy = 2,2 0 -bipyridyl, en = ethylenediamine] have been synthesized and characterized by physicochemical and spectroscopic methods. Complexes 1 and 2 crystallize in monoclinic space group P21/c, and possess a distorted octahedral geometry. Significant hydrogen bonding interactions are found in both complexes.

Interaction of E. coli DNA with diazine-bridged late first row transition metal complexes derived from hexadentate compartmental ligands: an approach to DNA cleavage/binding studies

“…Charge transfer bands were present at 423 and 348 nm. The [24,25]. Finally, [Cu 2 L 1 (l-Cl)(H 2 O) 2 ] shows mediumintensity bands at *570 and 600 nm, corresponding to d-d transitions, and a low energy broad asymmetric band near 600 nm as observed earlier for related cyclic and acyclic copper complexes with square pyramidal geometry [19].…”

“…4 A 2g transition, well within the range for octahedral Co II complexes [22,23]. In [Ni 2 L 2 (l-Cl)Cl 2 (H 2 O) 2 ], the bands around 680, 530 and 495 nm can be attributed, in an octahedral [24,25] model, to the three spin allowed transitions, 3 A 2g ? 3 T 2g , 3 [26].…”

Spectroscopic, structural and magnetic studies of nickel(II) complexes with tetra- and pentadentate ligands

“…As an extention of our previous work [5,6], we now report two nickel complexes namely [Ni(BPSE)](BF 4 ) 1 and [Ni(5-BST)CH 3 OH]ClO 4 2. Both complexes were characterized by single crystal X-ray diffraction analysis, spectroscopic, and cyclic voltammetric measurements.…”

“…The synthesis of low molecular weight nickel(II) complexes mimicking superoxide dismutase (SOD) activity has been challenging for bioinorganic chemists and recently some complexes with high catalytic activity have been reported [4][5][6]. Nickel-containing superoxide dismutase (NiSOD) has been isolated from several Streptomyces species [7,8].…”

[μ-N,N′-Bis(2-aminoethyl)ethane-1,2-diamine-κ4N1,N1′:N2,N2′]bis{[N,N′-bis(2-aminoethyl)ethane-1,2-diamine-κ4N,N′,N′′,N′′′]cadmium} tetrakis(perchlorate)

“…For polynuclear complexes of cadmium, see: Evans & Lin (2002); For background to the use of the trien ligand in complexation, see: Cai et al (2001a,b); Buckingham et al (1974Buckingham et al ( , 1975; Chowdhury et al (2007). Buckingham & Jones (1965); Shinohara et al (1991); He (2009) ;Patel et al (2008); Anderson et al (1977); Shoukry et al (1998);Hu et al (2000). For dinuclear Cd complexes, see: Das et al (2010); Nie et al (2010); Wang et al (2011);Sun et al (2010).…”