Synthesis and characterization of two nicotinate-containing cadmium complexes in a tripodal ligand system

Abstract

Two nicotinate-containing cadmium(II) complexes were synthesized and structurally characterized. [Cd(ntb)(nic)]ClO₄ · 0.5CH₃OH (1) (ntb = tris(2-benzimidazolylmethyl)amine, nic = nicotinate anion) crystallized in the triclinic space group P-1 with a = 13.9979(17) Å, b = 14.0344(18) Å, c = 17.738(3) Å and α = 104.386(10)°, β = 93.317(12)°, γ = 110.081(8)°. The central Cd(II) is coordinated by four nitrogen atoms of ntb and two oxygen atoms of nicotinate to form a distorted octahedral geometry. [Cd(tren)(nic)]BPh₄ (2) (tren = tris(2-aminoethyl)amine) crystallized in the monoclinic crystal system, P2₁/c space group with a = 18.610(6) Å, b = 10.1620(16) Å, c = 20.0085(18) Å and β = 111.230(11)°. The central Cd(II) is coordinated by four nitrogen atoms of tren and one oxygen atom of nicotinate to form a distorted trigonal bipyramidal geometry. A tetramer for 1 and a dimer for 2 are formed through intermolecular hydrogen-bonding.

Keywords:

• Cadmium(II)
• Nicotinic acid
• Tris(2-benzimidazolylmethyl)amine
• Tris(2-aminoethyl)amine
• X-ray structure

Acknowledgments

This study was supported by Beijing Natural Science Foundation (Grant No. 2092010), Beijing Municipal Education Commission research program (Grant No. KM200810028009), and the Scientific Research Foundation for Returned Overseas Chinese Scholars, Beijing Municipal Government.