Kesavan, Praseetha E.Praseetha E.KesavanPandey, VijayalakshmiVijayalakshmiPandeyIshida, MasatoshiMasatoshiIshidaFuruta, HiroyukiHiroyukiFurutaMori, ShigekiShigekiMoriGupta, ItiItiGupta2025-08-312025-08-312020-07-0110.1002/asia.2020004632-s2.0-85085880344https://d8.irins.org/handle/IITG2025/2410532406966Beta-pyrrole-substituted porphyrin dyads connected by ethynyl linkage to N-butylcarbazole or triphenylamine donors are reported. Donor-π-acceptor type beta-substituted porphyrin dyads and their Zn(II) and Pd(II) complexes were characterized by MALDI-MS, NMR, UV-vis absorption, fluorescence and cyclic voltammetry techniques. The S<inf>1</inf> emission dynamics were analyzed by time-resolved spectroscopy (TCSPC); dyads exhibited efficient energy transfer up to 93% from beta-donors (N-butylcarbazole or triphenylamine group) to the porphyrin core. The efficiency of energy transfer for the beta-substituted porphyrin dyads were much higher than those of the corresponding meso-substituted porphyrin dyads, reflecting enhanced communications between the beta-donors and the porphyrin core. The Pd(II) dyads, showed characteristic phosphorescence in the near IR region and very efficient singlet oxygen quantum yields (53–60%); these dyads are promising candidates for photocatalytic oxidations of organic compounds. The donor-acceptor interaction between the porphyrin core and the beta-donors was supported by the DFT studies in the porphyrin dyads.falsebeta-substituted porphyrin | Cyclic Voltammetry | D-A systems | Energy Transfer | FluorescenceArticle1861471X2015-20281 July 202016arJournal13WOS:000536997500001