Hameed Majid Advanced Polymeric Materials Research Lab., Physics Department, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq.
Department of Civil Engineering, College of Engineering, Komar University of Science and Technology, Sulaimani 46001, Kurdistan Regional Government, Iraq.
Molecules. 2022 Mar 18;27(6):1965. doi: 10.3390/molecules27061965.
In this work, the green method was used to synthesize Sn-metal complex by polyphenols (PPHs) of black tea (BT). The formation of Sn-PPHs metal complex was confirmed through UV-Vis and FTIR methods. The FTIR method shows that BT contains NH and OH functional groups, conjugated double bonds, and PPHs which are important to create the Sn-metal complexes. The synthesized Sn-PPHs metal complex was used successfully to decrease the optical energy band gap of PVA polymer. XRD method showed that the amorphous phase increased with increasing the metal complexes. The FTIR and XRD analysis show the complex formation between Sn-PPHs metal complex and PVA polymer. The enhancement in the optical properties of PVA was evidenced via UV-visible spectroscopy method. When Sn-PPHs metal complex was loaded to PVA, the refractive index and dielectric constant were improved. In addition, the absorption edge was also decreased to lower photon. The optical energy band gap decreases from 6.4 to 1.8 eV for PVAloaded with 30% (/) Sn-PPHs metal complex. The variations of dielectric constant versus wavelength of photon are examined to measure localized charge density (/) and high frequency dielectric constant. By increasing Sn-PPHs metal complex, the / are improved from 3.65 × 10 to 13.38 × 10 m Kg. The oscillator dispersion energy () and average oscillator energy () are measured. The electronic transition natures in composite films are determined based on the Tauc's method, whereas close examinations of the dielectric loss parameter are also held to measure the energy band gap.
在这项工作中，采用多酚（PPHs）的红茶（BT）的绿色方法合成了 Sn-金属配合物。通过紫外-可见和傅里叶变换红外（FTIR）方法证实了 Sn-PPHs 金属配合物的形成。FTIR 方法表明，BT 含有 NH 和 OH 官能团、共轭双键和 PPHs，这些官能团对形成 Sn-金属配合物很重要。成功地将合成的 Sn-PPHs 金属配合物用于降低 PVA 聚合物的光学能带隙。XRD 方法表明，随着金属配合物的增加，非晶相增加。FTIR 和 XRD 分析表明 Sn-PPHs 金属配合物与 PVA 聚合物之间存在配合物形成。通过紫外-可见光谱法证实了 PVA 光学性能的增强。当 Sn-PPHs 金属配合物负载到 PVA 中时，折射率和介电常数得到提高。此外，吸收边缘也降低到较低的光子能量。当 PVA 负载 30%（/）Sn-PPHs 金属配合物时，光学能带隙从 6.4 降低到 1.8 eV。通过测量局部电荷密度（/）和高频介电常数，研究了介电常数随光子波长的变化。通过增加 Sn-PPHs 金属配合物，从 3.65×10 提高到 13.38×10 m Kg。测量了振子色散能（）和平均振子能（）。基于 Tauc 法确定了复合膜中电子跃迁的性质，同时还进行了介电损耗参数的详细检查，以测量能带隙。
