Title
Cd(II) and Cu(II) coordination polymers constructed from the expanded 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene ligand: Conventional and ultrasound-assisted synthesis, crystal structure, luminescence and magnetic properties
Author
Negar Rad-Yousefnia, Behrouz Shaabani, Mansoureh Zahedi, Maciej Kubicki, Muhittin Aygün, Francesc Lloret, Miguel Julve, Anita Grześkiewicz, Mohammad Sadegh Zakerhamidi, Canan Kazak
Year
2018
Journal
New Journal of Chemistry
Abstract
A 3D open inorganic/organic framework, {[Cd(µ-L)(µ3-SO4)(H2O)].H2O}n (1) [L = 1,4-bis(4-pyridyl)-2,3-diaza-1,3-butadiene] was synthesized by the reaction of CdSO4.8H2O with L. The treatment of Cu(NO3)2.3H2O with the same N, N′-donor ligand in two different solvent mixtures, methanol/dichloromethane (2), and methanol/chloroform (3) afforded two new ladder-like coordination polymers of formula {[Cu(µ-L)(µ-NO3)(NO3)].solv}n [solv = CH2Cl2 (2) and CHCl3 (3)]. These non-interpenetrated ladder motifs 2 and 3 enclathrate the uncoordinated solvent molecules. Crystalline coordination polymers 1 and 3 were also successfully prepared by a sonochemical method under different reaction conditions. Our results indicate that the size of the particles is dependent upon the irradiation time. 1 and 3 exhibit intense luminescent emissions in the solid state at room temperature. Cyomagnetic measurements of 3 show the occurrence of a ferromagnetic interaction between the copper(II) ions through the double oxo-nitrate bridge together with a very weak inter-ladder antiferromagnetic interaction [J = +4.93(2) cm-1, g = 2.10(1) and Θ = -0.567(5) K].
Instrument
FP-6200
Keywords
Fluorescence, Solid state, Optical properties, Polymers, Inorganic chemistry