0D+1D=1D Zn-orotate-Bimb polyrotaxane coordination polymer: Synthesis, structure, thermogravimetric and variable temperature luminescence analysis

A new polyrotaxane coordination polymer {[Zn(Or)(Bimb)(H2O)](2)center dot 6H(2)O}n (1) has been synthesized using Zn(II) ion with 1,4-bis[(1H-imidazol-1-yl)methyl]benzene) (Bimb) and potassium orotate (OrK) ligands at ambient temperature. Single-crystal X-ray diffraction, elemental analysis, variable temperature Powder X-ray diffraction (VT-PXRD), variable temperature FTIR (VT-FTIR) and TG/DT/TDG were used to characterize the complex. Complex (1) contains 0D binuclear Zn(1)-based molecular loop , 1D Zn(2)-based molecular string yielding to 0D + 1D = 1D polyrotaxane coordination polymers. Supramolecular network in complex (1) is stabilized by classical strong N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds resulting in the formation of 2D inter-layer polyrotaxane coordination polymers and 3D supramolecular network via these non-covalent interactions. The solidstate variable temperature-luminescence studies of as synthesized and heated forms of (1) emit strong luminescence in the range of 363-439 nm (2.82-3.41 eV) with slight contrast in physical facade. The thermal breakdown of (1) yielded spherical shaped ZnO nanoparticles with diameters of ? 32 nm, as confirmed by FESEM, EDAX.

Automated summary

A new polyrotaxane coordination polymer has been synthesized and characterized using various techniques. The polymer exhibits a unique structure consisting of 0D and 1D components, and forms 2D and 3D supramolecular networks through hydrogen bonding. Furthermore, the polymer shows strong luminescence properties and undergoes thermal decomposition to form ZnO nanoparticles.