Gadolinium(III) and dysprosium(III) complexes with a Schiff base bis(N-salicylidene)-3-oxapentane-1,5-diamine: synthesis, characterization, antioxidation, and DNA-binding studies

Abstract

A pentadentate Schiff base bis(N-salicylidene)-3-oxapentane-1,5-diamine (H 2 L) and its lanthanide (III) complexes, [GdL(NO 3 )(DMF)(H 2 O)] (1) and [Dy 2 L 2 (NO 3 ) 2 ]·2H 2 O (2), have been synthesized and characterized by physical, chemical, and spectroscopic methods. Single crystal X-ray structure reveals that 1 is a discrete mononuclear species with nine-coordinate Gd(III) in a distorted monocapped square antiprism geometry. Complex 2 is a centrosymmetric binuclear neutral entity, in which Dy(III) is eight-coordinate in a distorted square antiprism. Electronic absorption titration spectra, ethidium bromide competitive experiments, and viscosity measurements indicate that both the ligand and complexes bind calf thymus DNA, presumably via groove binding. Investigations of antioxidant activities show that both complexes have some scavenging effects for hydroxyl and superoxide radicals.

Trinuclear Co(II) and Mononuclear Ni(II) Salamo-Type Bisoxime Coordination Compounds

“…N 2 O 2 -type chelating ligands and their metal coordination compounds have achieved considerable attention in inorganic chemistry over several decades [1][2][3], especially in the area of their potential application in catalysts [4,5], biological fields [6][7][8][9][10], electrochemical conducts [11], ion recognitions [12][13][14][15][16], supramolecular architecture [17][18][19][20], as well as magnetic [21][22][23][24] and luminescence [25,26] materials. Recently, a new N 2 O 2 -type analogue, the Salamo ligand was developed [27][28][29][30][31][32].…”

Tri- and Mono-Nuclear Zinc(II) Complexes Based on Half- and Mono-Salamo Chelating Ligands

“…As we know, Salen-type ligands (R-CH=N-(CH 2 ) 2 -N=CH-R) and their metal complexes have been extensively investigated in modern coordination chemistry for several decades [1][2][3][4][5], which have been extensively investigated in potential application in biological fields [6][7][8][9][10][11][12][13], electrochemical conducts [14,15], nonlinear optical materials [16][17][18][19][20], magnetic materials [21][22][23][24][25], luminescence properties [26][27][28][29][30][31][32], and supramolecular architecture [33][34][35][36][37], and so on. Chemical modifications of substituent or functional groups in the Salen N 2 O 2 ligands are effective in exchanging the structures or the main functions of complexes, such as salamo ligand, a Salen analogue, (R-CH=N-O-(CH) n -O-N=CH-R) is one of the most versatile ligands and the large electronegativity of oxygen atoms is expected to strongly affect the electronic properties of the N 2 O 2 coordination sphere, which can lead to different and novel structures and properties of the resulting complexes [38].…”

Structural and Luminescent Properties of Heterobimetallic Zinc(II)-Europium(III) Dimer Constructed from N2O2-Type Bisoxime and Terephthalic Acid

“…Salen-type N 2 O 2 ligands are easily obtained via the reaction of salicylaldehyde or its derivatives with diamines, can coordinated to transition metal ions in a N 2 O 2 tetradentate chelating mode to form stable mono-or multinuclear complexes [1][2][3][4][5][6]. Salen-and salamo-type complexes have been extensively investigated in organometallic chemistry and modern coordination chemistry for several decades [7][8][9][10][11], their complexes are well-known for their potential applications in many areas, such as catalysts [12,13], biological fields [14][15][16][17][18][19][20][21], supramolecular buildings [22][23][24][25][26], molecular recognitions [27][28][29][30][31], magnetic [32][33][34][35][36][37] and luminescence [38][39][40][41][42][43][44][45] materials and so forth.…”