1H NMR study of kinetics of the Ni(II) and Zn(II) cations complex formation with 2-aza-5,10,15,20-tetraphenyl-21-carbaporphyrin

Sobornova, V.V.; Maltceva, Olga V.; Khodov, Ilya A.; Мамардашвили, Н. Ж.

doi:10.1016/j.ica.2023.121638

Cited by 1 publication

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, porphyrins and their metal derivatives have been widely used as the basic units of porous materials such as metal-organic frameworks (MOFs) and covalent organic frameworks (COFs). This makes porphyrins and their derivatives promising for a variety of applications, for example, as biosensors, catalysts, and for drug delivery and chemical storage [ 2 , 3 , 4 , 5 ]. 5,10,15,20-tetrakis(p-hydroxyphenyl)porphyrin (THPP) is a derivative of porphyrin that plays important roles in photosynthesis and electron transfer [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Solvent Polarity on the Spectral Characteristics of 5,10,15,20-Tetrakis(p-hydroxyphenyl)porphyrin

Guo

Liu

et al. 2023

Molecules

View full text Add to dashboard Cite

The electronic absorption and vibrational spectra of deprotonated 5,10,15,20-tetrakis(p-hydroxyphenyl)porphyrin (THPP) are studied as a function of solvent polarity in H2O-DMF, H2O-acetone, H2O-methanol, and DMF-acetone mixtures. The maximum absorption wavelength (λmax) of the lowest energy electronic absorption band of deprotonated THPP shows an unusual solvatochromism-a bathochromic followed by a hypsochromic shift with reduced polarity. According to the correlation analysis, both specific interactions (H-bonds) and nonspecific interactions affect the spectral changes of this porphyrin. Furthermore, the solvent polarity scale ET(30) can explain both shifts very well. At higher polarity (ET(30) > 48), THPP exists as a hyperporphyrin. The ET(30) is linear with λmax and a decrease in solvent polarity is accompanied by a bathochromic shift of λmax. These results can be rationalized in terms of the cooperative effects of H-bonds and nonspecific interactions on the spectra of hyperporphyrin. At relatively low polarity (45.5 < ET(30) < 48), hyperporphyrin gradually becomes Na2P as ET(30) reaches the critical value of 45.5. The spectrum of the hyperporphyrin turns into the three-band spectrum of the metalloporphyrin, which is accompanied by a hypsochromic shift of λmax.

show abstract