Photophysical Properties and Kinetic Studies of 2-Vinylpyridine-Based Cycloplatinated(II) Complexes Containing Various Phosphine Ligands

Molecules

Reza Babadi Aghakhanpour¹  Vahideh Dolatyari¹  HamidR. Shahsavari¹  Sareh Paziresh¹  Sepideh Habibzadeh²  Mohsen Golbon Haghighi³  MohammadReza Halvagar⁴ 

[1] Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran;Department of Chemistry, Payame Noor University, Tehran P.O. BOX 19395-4697, Iran;Department of Chemistry, Shahid Beheshti University, Evin, Tehran 19839-69411, Iran;Department of Inorganic Chemistry, Chemistry and Chemical Engineering Research Center of Iran, Tehran 14968-13151, Iran;

关键词: 2-vinylpyridine;    cycloplatinated(II);    photophysics;    kinetic;    phosphine;   

DOI  :  10.3390/molecules26072034

来源: DOAJ

【 摘 要 】

A series of cycloplatinated(II) complexes with general formula of [PtMe(Vpy)(PR₃)], Vpy = 2-vinylpyridine and PR₃ = PPh₃ (1a); PPh₂Me (1b); PPhMe₂ (1c), were synthesized and characterized by means of spectroscopic methods. These cycloplatinated(II) complexes were luminescent at room temperature in the yellow–orange region’s structured bands. The PPhMe₂ derivative was the strongest emissive among the complexes, and the complex with PPh₃ was the weakest one. Similar to many luminescent cycloplatinated(II) complexes, the emission was mainly localized on the Vpy cyclometalated ligand as the main chromophoric moiety. The present cycloplatinated(II) complexes were oxidatively reacted with MeI to yield the corresponding cycloplatinated(IV) complexes. The kinetic studies of the reaction point out to an S_N2 mechanism. The complex with PPhMe₂ ligand exhibited the fastest oxidative addition reaction due to the most electron-rich Pt(II) center in its structure, whereas the PPh₃ derivative showed the slowest one. Interestingly, for the PPhMe₂ analog, the trans isomer was stable and could be isolated as both kinetic and thermodynamic product, while the other two underwent trans to cis isomerization.

【 授权许可】

Unknown