Expanding the scope of ‘Click’ derived 1,2,3-triazole ligands: New palladium and platinum complexes
摘要:
Using the 'Click Protocol' the new ligands 1-(cyclohexyl)-4-(2-pyridyl)-1,2,3-triazole (1), 1-(2-trifluoromethyl phenyl)-4-(2-pyridyl)-1,2,3-triazole (2), 1-(4-hexyl phenyl)-4-(2-pyridyl)-1,2,3-triazole (3), 1-(2-mercaptomethyl phenyl)-4-(2-pyridyl)-1,2,3-triazole (4) and 1-(4-N, N-dimethylamino phenyl)-4-(2-pyridyl)-1,2,3-triazole (5) were prepared by reacting 2-ethynylpyridine with the corresponding azides. In the next step the ligands were reacted with suitable palladium and platinum precursors to yield the cis-dichloro-palladium complexes 1a-4a and platinum complexes 1b-4b. Investigation of the molecular structure of the free ligands 1 and 5 reveals the formation of infinite chains in the 3D structure which are governed by hydrogen bonds between the triazole units. Likewise the 3D structure of 1a shows infinite chains which are held together by multiple remarkably short C-H center dot center dot center dot Cl-Pd contacts. Electrochemical investigation of the free ligands by cyclic voltammetry showed irreversible reduction processes at highly negative potential. Upon metal complexation huge anodic shifts of the reduction potential were observed. To further characterize the electronic properties of all the compounds UV-Vis spectra were also analyzed. (C) 2011 Elsevier B.V. All rights reserved.
Aromatic azides are formed in high yield from arenediazonium tosylates and sodium azide in water at room temperature or from aromatic amines via diazotization in the presence of p-TsOH. Besides being experimentally simple, these methods do not require any metal catalysis and provide clean products without purification.
New type of ruthenium sensitizers with a triazole moiety as a bridging group
作者:Sanghyun Paek、Chul Baik、Moon-sung Kang、Hongsuk Kang、Jaejung Ko
DOI:10.1016/j.jorganchem.2009.12.021
日期:2010.3
A new type of ruthenium sensitizers JK-91 and JK-92 with a triazole moiety as a bridging group were designed and synthesized in an attempt to increase the pi-conjugated system. Two compounds work as highly efficient sensitizers for the dye-sensitized nanocrystalline TiO2 solar cell. Under standard AM 1.5 sunlight, the sensitizer JK-91 yielded a short-circuit photocurrent density of 12.55 mA/cm(2), an open-circuit voltage of 0.73 V, and a fill factor of 0.73, corresponding to an overall conversion efficiency of 6.75%. (C) 2010 Elsevier B.V. All rights reserved.