Synthesis, crystal structures, and catalytic hydrolysis activities of four dinuclear complexes with 1,4,7,10-tetraazacyclododecane and succinate ligands

Abstract

Four new dinuclear complexes of the type [M 2 (cyclen) 2 (suc)]Cl 2 Á nH 2 O (M = Co 2? , Ni 2? , Cu 2? , Zn 2? , cyclen = 1,4,7,10-tetraazacyclododecane, suc = succinate) have been obtained by the reaction of cyclen and succinate with the corresponding metal dichlorides in aqueous solution. All the complexes were characterized by physico-chemical and spectroscopic methods. The crystal structure of [Ni 2 (cyclen) 2 (suc)]Cl 2 Á 2H 2 O was determined. The four complexes have similar compositions and structures and are all bridged by succinate. Furthermore, the hydrolysis of bis(2,4-dinitrophenyl)phosphate (BDNPP) promoted by the four complexes was studied. The experimental results indicate that these complexes can efficiently catalyze hydrolysis of BDNPP, and their catalytic activities are in the order Ni [ Zn [ Cu [ Co.

Vesicles and Micelles from Amphiphilic Zinc(II)–Cyclen Complexes as Highly Potent Promoters of Hydrolytic DNA Cleavage

“…Understanding and mimicking these enzymes still represents a challenge for chemists. A variety of different synthetic catalysts for hydrolysis of DNA and corresponding model substrates have been reported, usually based on lanthanide or transition metal ions like Cu(II), Ni(II), Co(II), and Zn(II) . Although Zn(II) ions were occasionally reported to be less efficient, they are the choice of hydrolytic enzymes.…”

Template‐Directed Synthesis of Two Dinuclear Ni(II) Complexes together with Their Interconversion, Crystal Structures and DNA‐Binding Studies

“…The dihedral angle between the (N amine ) 2 O 2 and (N imine ) 2 O 2 plane is 23.68(73)°. Hydrogen‐bond interactions play an important role in maintaining the 3‐D network [19–21] . Here, perchlorate, methanol and water molecule are H‐bond acceptors, which link molecules through the following hydrogen‐bonding interactions: O5−H5A⋅⋅⋅O6, O6−H6A⋅⋅⋅O2, O6−H6A⋅⋅⋅O5, C24−H24A⋅⋅⋅O6, C31−H31⋅⋅⋅O9, O6−H6B⋅⋅⋅O9, respectively.…”

Synthesis and Crystal Structure of Two Succinato‐Bridged Macrocyclic Nickel(II) Complexes

“…The design and synthesis of extended bridged polymetallic complexes have attracted special attention due to their potential applications in magneto‐ and materials chemistry 1–7. Many dinuclear complexes, where the metal ions are bridged by extended multidentate ligands such as μ‐terephthalate,8–11 μ‐oxalate,12–17 μ‐N 3 ,18–21 and μ‐butene dicarboxylate,22 have been reported. In our previous report,11 we used rigid terephthalic acid ligand bridging macrocyclic nickel(II) complexes to construct 1D hydrogen bonded helical chains.…”