Designing of Pb(II)-Based Novel Coordination Polymers (CPs): Structural Elucidation and Optoelectronic Application.

Abstract

[Pb2(bdc)1.5(aiz)]n (1) and [Pb2(bdc)1.5(aiz)(MeOH)2]n (2) (H2bdc = 1,4-benzene dicarboxylic acid, aiz = (E)-N′-(thiophen-2-ylmethylene)isonicotinohydrazide) have been synthesized, and structural characterization has been established by X-ray analysis and thermogravimetric analysis (TGA). Here, bdc2– links two Pb(II) centers and the aiz ligand binds the metal centers in two different manners: chelating and monodonating. Thus, polymerizations have taken place from the combination of mixed ligand system. Optical band gaps have been studied via UV measurements. Again, the experimental and calculated (from density functional theory (DFT)) band gaps agree well and the semiconducting properties of synthesized polymeric materials have been approved. Thus, optoelectronic and photonic devices can be made by this type of coordination polymers (CPs). The I–V representative curves of 1 (device-A) and 2 (device-B) in both dark and illuminated conditions show that device-A has a higher magnitude of current than device-B. Dark- and photo-conductivity values of device-A are calculated as 2.94 × 10–6 and 6.12 × 10–6 S m–1, respectively, whereas for device-B, the values of dark- and photo-conductivity are 2.92 × 10–7 and 3.66 × 10–7 S m–1, respectively, at room temperature.