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• W3127591246 abstract "Abstract The first comparative DFT (B3LYP/6-31G*) study of the Zn-porphyrin and its two derivatives, ZnP(P) 4 and ZnP(As) 4 , is reported. For all three species studied, ZnP, ZnP(P) 4 and ZnP(As) 4 , the singlet was calculated to be the lowest-energy structure and singlet-triplet gap was found to decrease from ca. 41—42 kcal/mol for N to ca. 17—18 kcal/mol for P and to ca. 10 kcal/mol for As. Both ZnP(P) 4 and ZnP(As) 4 were calculated to attain very pronounced bowl-like shapes. The frontier molecular orbitals (MOs) of the core-modified porphyrins are quite similar to the ZnP frontier MOs. For the HOMO-2 of the core-modified porphyrins due to the ZnP(P) 4 /ZnP(As) 4 bowl-like shapes we might suppose the existence of “internal” electron delocalization inside the ZnP(P) 4 /ZnP(As) 4 “bowls”. Noticeable reduction of the HOMO/LUMO gaps was calculated for ZnP(P) 4 and ZnP(As) 4 , by ca. 1.10 and 1.47 eV, respectively, compared to ZnP. The core-modification of porphyrins by P and especially by As was found to result in significant decrease of the charge on Zn-centers, by ca. 0.61—0.67e for P and by ca. 0.69—0.76e for As. Charges on P- and As-centers were computed to have large positive values, ca. 0.41—0.45e and ca. 0.43—0.47e, for P and As, respectively, compared to significant negative values, ca. −0.65 to −0.66e for N. The porphyrin core-modification by heavier N congeners, P and As, can noticeably modify the structures, electronic, and optical properties of porphyrins, thus affecting their reactivity and potential applications." @default.
• W3127591246 created "2021-02-15" @default.
• W3127591246 creator A5047658314 @default.
• W3127591246 date "2021-02-08" @default.
• W3127591246 modified "2023-09-27" @default.
• W3127591246 title "Comparison of P- and As-core-modified porphyrins with the parental porphyrin: a computational study" @default.
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• W3127591246 doi "https://doi.org/10.1515/pac-2020-1105" @default.
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