Spectrophotometric Study of Bridging N-Donor Ligand-Induced Supramolecular Assembly of Conjugated Zn-Trisporphyrin with a Triphenylamine Core.
Molecules
; 26(16)2021 Aug 06.
Article
em En
| MEDLINE
| ID: mdl-34443364
ABSTRACT
This article studies the supramolecular assembly behavior of a Zn-trisporphyrin conjugate containing a triphenylamine core (1) with bridging N-donor ligands using the UV-vis spectrophotometric titration method at micromolar concentrations. Our results show that pyridine, a non-bridging ligand, formed a 31 open complex with 1. The corresponding binding constant was estimated to be (2.7 ± 0.15) × 1014 M-3. In contrast, bridging ligands, 4,4-bipyridine (BIPY) and 1,3-di(4-pyridyl)propane (DPYP), formed stable 32 double-decker complexes with 1 in solution, which collapsed to yield a 31 open complex when excess BIPY or DPYP was added. The binding constants for forming BIPY and DPYP double-decker complexes were estimated to be (9.26 ± 0.07) × 1027 M-4 and (3.62 ± 0.16) × 1027 M-4, respectively. The UV-vis titration profiles supported the conclusion that the degradation of the 32 double-decker 1âBIPY complex is less favorable compared to that of 1âDPYP. Consequently, the formation of the 31 1âDPYP open complex proceeded more readily than that of 1âBIPY.
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MEDLINE
Idioma:
En
Ano de publicação:
2021
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Article