A novel mixed ligand Zn-coordination polymer: Synthesis, crystal structure, thermogravimetric analysis and photoluminescent properties.

A novel, potassium orotate (OrK) and 1,3 di (4-pyridyl) propane (dpp) based, coordination network of Zn synthesized at room temperature. The emission spectrum of the Zn-complex recorded with 290 nm excitation wavelength reveals that complex has strong luminescence with the peak maximum 380 nm (3.2627 eV) and thermal stability of 1 upto 350 °C owing to different coordination environment around zinc atoms and crystal packing. • The syn-anti μ2η1:η1 bridging carboxylate and pyridyl extended the Or-Zn-dpp moiety into 2D coordination network showing square grid sheet. • The emission spectrum of Zn-complex was recorded with 290 nm excitation wavelength which reflects that 1 has strong luminescence with peak maximum of 380 nm (3.2627 eV). A novel mixed ligand based coordination network of Zn, having formula [Zn 8 (Or) 8 (dpp) 4 (H 2 O) 8 n (1), have been engineered and synthesized at room temperature by self-assembly of potassium orotate (OrK) and 1,3 di(4-pyridyl)propane (dpp) with metal salt, Zn(OAc) 2 ·2H 2 O Single crystal X-ray structural analysis reveals that coordination sphere around Zn(II) ions, in Or-Zn-dpp moiety, having different atomic arrangement with distorted square pyramidal geometry. The syn-anti μ2η1:η1 bridging carboxylate and pyridyl moieties extended the Or-Zn-dpp skeleton into 2D coordination network showing square grid sheet. The emission spectrum of Zn-complex was recorded with 290 nm excitation wavelength which reflects that 1 has strong luminescence with peak maximum of 380 nm (3.2627 eV) and is a result of the n – π * and π – π * transitions of H 3 Or and dpp ligand. Thermogravimetric analysis shows that when the coordinated water molecule completely comes out from the complex around 320 °C, the dehydrated forms steadily starts to degrade, and the complete decomposition is observed above 350 °C. [ABSTRACT FROM AUTHOR]