Synthesis and Dynamic Behavior of Ce(IV) Double-Decker Complexes of Sterically Hindered Phthalocyanines

Phthalocyanines and their double-decker complexes are interesting in designing rotative molecular machines, which are crucial for the development of molecular motors and gears. This study explores the design and synthesis of three bulky phthalocyanine ligands functionalized at the α-positions with p...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2024-02, Vol.29 (4), p.888
Main Authors: Subramaniam, Jeevithra Dewi, Nishino, Toshio, Yasuhara, Kazuma, Rapenne, Gwénaël
Format: Article
Language:English
Subjects:
cerium ion
Chemical Sciences
Chromatography
Coordination chemistry
double-decker complex
heteroleptic
homoleptic
ligand rotation
Ligands
Lithium
Magnetic properties
Metals
Microwave heating
Nitrogen
phthalocyanine
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Summary:Phthalocyanines and their double-decker complexes are interesting in designing rotative molecular machines, which are crucial for the development of molecular motors and gears. This study explores the design and synthesis of three bulky phthalocyanine ligands functionalized at the α-positions with phenothiazine or carbazole fragments, aiming to investigate dynamic rotational motions in these sterically hindered molecular complexes. Homoleptic and heteroleptic double-decker complexes were synthesized through the complexation of these ligands with Ce(IV). Notably, and , both homoleptic complexes, exhibited blocked rotational motions even at high temperatures. The heteroleptic complex, designed to lower symmetry, demonstrated switchable rotation along the pseudo-C symmetry axis upon heating the solution. Variable-temperature H-NMR studies revealed distinct dynamic behaviors in these complexes. This study provides insights into the rotational dynamics of sterically hindered double-decker complexes, paving the way for their use in the field of rotative molecular machines.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules29040888