Amide-driven secondary building unit structural transformations between Zn(II) coordination polymers
Ejarque, Daniel (Universitat Autònoma de Barcelona. Departament de Química)
Calvet, Teresa (Universitat de Barcelona. Departament de Mineralogia, Petrologia i Geologia Aplicada)
Font-Bardia, Mercè (Universitat de Barcelona. Centres Científics i Tecnològics)
Pons Picart, Josefina (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2022
Resum:	The behavior of coordination polymers (CPs) against external stimuli has witnessed remarkable attention, especially when the resulting CPs present reversible molecular arrays. Accordingly, CPs with these characteristics can lead to differences in their properties owing to these structural differences, being promising for their use as potential molecular switches with diverse applications. Herein, we have synthesized four Zn(II) CPs bearing α-acetamidocinnamic acid (HACA) and 4,4'-bipyridine (4,4'-bipy). The reaction between Zn(OAc)2·2H2O, HACA, and 4,4'-bipy yields {[Zn(ACA)2(4,4'-bipy)]·EtOH}n (1), which was used for the formation of three CPs through dissolution-recrystallization structural transformations (DRSTs): {[Zn(ACA)2(4,4'-bipy)]·2MeOH}n (2), {[Zn2(μ-ACA)2(ACA)2(4,4'-bipy)]·2H2O}n (3), and {[Zn3(μ-ACA)6(4,4'-bipy)]·0. 75CHCl3}n (4). The study of the four crystal structures revealed that their secondary building units (SBUs) comprise monomeric, dimeric, and trimeric arrangements linked by 4,4'-bipy ligands. The fundamental role of the utilized solvent and/or temperature, as well as their effect on the orientation of the amide moieties driving the formation of the different SBUs is discussed. Furthermore, the reversibility and interconversion between the four CPs have been assayed. Finally, their solid-state photoluminescence has evinced that the effect of the amide moieties not only predetermine a different SBU but also lead to a different emission in 4 compared with 1-3.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1687
Nota:	Altres ajuts: acords transformatius de la UAB
Nota:	Altres ajuts: J.P. acknowledges financial support from the CB615921 project, the CB616406 project from "Fundació La Caixa". D.E. acknowledges the PIF predoctoral fellowship from the Universitat Autònoma de Barcelona.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Amide moieties ; Coordination Polymers ; Coordination-polymers ; External stimulus ; Molecular arrays ; Molecular switches ; Property ; Secondary building units ; Structural differences ; Structural transformation
Publicat a:	Crystal Growth and Design, Vol. 22, issue 8 (August 2022) , p. 5012-5026, ISSN 1528-7505

DOI: 10.1021/acs.cgd.2c00520
PMID: 35971411

15 p, 6.7 MB

Material suplementari 21 p, 2.7 MB

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