Lanthanide Identity Governs Guest-Induced Dimerization in LnIII [15-MC Cu II N(L-pheHA) -5])3+ Metallacrowns.
Chemistry
; 27(70): 17669-17675, 2021 Dec 15.
Article
de En
| MEDLINE
| ID: mdl-34637566
ABSTRACT
Series of lanthanide-containing metallic coordination complexes are frequently presented as structurally analogous, due to the similar chemical and coordinative properties of the lanthanides. In the case of chiral (LnIII [15-MC Cu II N(L-pheHA) -5])3+ metallacrowns (MCs), which are well established supramolecular hosts, the formation of dimers templated by a dicarboxylate guest (muconate) in solution of neutral pH is herein shown to have a unique dependence on the identity of the MC's central lanthanide. Calorimetric data and nuclear magnetic resonance diffusion studies demonstrate that MCs containing larger or smaller lanthanides as the central metal only form monomeric host-guest complexes whereas analogues with intermediate lanthanides (for example, Eu, Gd, Dy) participate in formation of dimeric host-guest-host compartments. The driving force for the dimerization event across the series is thought to be a competition between formation of highly stable MCs (larger lanthanides) and optimally linked bridging guests (smaller lanthanides).
Mots clés
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Lanthanides
/
Complexes de coordination
Langue:
En
Journal:
Chemistry
Sujet du journal:
QUIMICA
Année:
2021
Type de document:
Article
Pays d'affiliation:
Italie