1,3-Bis(1,2,4-triazolyl)adamantine-based Coordination Polymers

The hybrid organic-inorganic materials known as coordination polymers are continuously gaining ground of scientific research, especially due to the interesting and promising functionalities they possess, e.g. magnetic, optical, electrical, redox, and luminescence properties, as well as, when permanent porosity is present, gas adsorption or separation, catalytic activity, and drug delivery. The reaction of the flexible ligand 1,3-bis(1,2,4-triazolyl)adamante (tr2ad, Scheme 1) with chlorides of different late transition metals, either following conventional routes or under solvothermal conditions, afforded the coordination polymers having the general stoechiometric formula of the type M(tr2ad)Cl2 (M = Zn,1; Cu, 2; Cd, 3; Ni, 4; Co, 5). Preliminary ab initio X-ray powder diffraction analyses revealed that 1 developes into a 1-D polymeric chain, while 2 features a 2-D polymeric structure. Thermal-gravimetric analyses (TGA) showed relevant thermal robustness of all these materials, peaking up to the onset of decomposition set at 350 °C.