Asif Hafiz Muhammad, Ashfaq Hafiza Fareeha, Zhou Yunshan, Zhang Lijuan, Iqbal Arshad, Hu Xin, Shehzad Farooq Khurum
State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Inorganic Research Laboratory, Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Punjab, I. R. Pakistan.
Dalton Trans. 2023 Aug 29;52(34):11850-11858. doi: 10.1039/d3dt01879b.
Five covalently bonded polyoxometalate (POM)-porphyrin hybrids were synthesized by reacting the Wells-Dawson type polyoxometalate [N(CH)]HPWVO with five tris-functionalized porphyrins containing different numbers of tris groups at different peripheral positions. These hybrids were thoroughly characterized using elemental analysis, NMR (H, P, and V), mass spectrometry (ESI-MS, MALID-TOF-MS), FT-IR, UV-Vis, and fluorescence spectroscopies. The results proved that different quantities (one, two, and three) of the vanadium-capped Wells-Dawson type metal-oxide cluster PWVO can be grafted onto a porphyrin moiety covalent bonding with different orientations, depending on the number and position of peripheral functional groups on the porphyrin. Interestingly, remarkable fluorescence quenching (60% in 3Py-P@1POM, 75% in -2PyP@2POM, 80% in -2PyP@2POM, 85% in -2PhP@2POM, and 55% in 1Py-P@3POM, as compared to the fluorescence intensity of their corresponding porphyrin precursor) was observed under excitation ( = 328 nm), indicating electron transfer from the porphyrin moiety to the POM moiety through covalent linkage.
