Supramolecular Isomerism in Cobalt(II) Coordination Polymers Built from 3,5-Bis(trifluoromethyl)benzoate and 4,4'-Bipyridine
Papi, Franscesco (Istituto Italiano di Tecnologia)
Rosado, Albert (Institut de Ciència de Materials de Barcelona)
Vallcorba Valls, Oriol (ALBA Laboratori de Llum de Sincrotró)
Lanza, Arianna (Istituto Italiano di Tecnologia)
Gemmi, Mauro (Istituto Italiano di Tecnologia)
Portoles-Gil, Nuria (Institut de Ciència de Materials de Barcelona)
Lopez-Periago, Ana M. (Institut de Ciència de Materials de Barcelona)
Domingo, Concepción (Institut de Ciència de Materials de Barcelona)
Ayllon, Jose Antonio (Universitat Autònoma de Barcelona. Departament de Química)

Data:	2022
Resum:	The reaction of [Co2(H2O)(TFMBz)4(py)4] (1) (TFMBz: 3,5-bis(trifluoromethyl)benzoate; py: pyridine) with 4,4'-bipyridine (bpy) in different solvents yields four coordination polymers with unlikely structures but with the same stoichiometry. Three of them contain similar ladder chains consisting of binuclear nodes "Co2(TFMBz)4", in which two of the TFMBz ligands show bidentate bridge coordination, double linked to each adjacent node by bpy but packed in different fashions. The different packing affects the compound porosity; thus, [Co2(TFMBz)4(bpy)2]n (2), precipitated using low-polarity solvents such as supercritical CO2 (scCO2), n-butyl acetate, or heptane and also in acetonitrile, is microporous, with a surface area of 330 m2 g-1, showing the N2 adsorption/desorption isotherm at 77 K with a gate-opening effect at low relative pressures (P/P0 = 0. 05). The isomer [Co2(TFMBz)4(bpy)2]n (3), synthesized in ethoxyethanol, presents a surface area of 230 m2 g-1. A third chain packing isomer, [Co2(TFMBz)4(bpy)2]n (4), is obtained in acetone and has only non-interconnected voids. Finally, precursor 1 is combined with bpy in a highly polar solvent such as water to give [Co(TFMBz)2(bpy)]n (5). In this isomer, all the carboxylate units act as bidentate bridging ligands, generating chains that are interlinked by bpy, leading to a 2D network, which after packing yields a non-porous structure. The resolution of structures 2-5 is only possible with the recently developed 3D electron diffraction method based on the collection of diffraction patterns on sub-micron-sized single crystals. The variation of magnetic susceptibility as a function of temperature is also measured. Overall, our work provides insightful information on the complex landscape of metal-organic framework solids that are formed by crystallization using different solvent media.
Ajuts:	Ministerio de Ciencia e Innovación CEX2019-000917-S Agencia Estatal de Investigación PID2020-115631GB-I00
Nota:	Altres ajuts: acords transformatius de la UAB
Drets:
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Crystal structure ; Ligands ; Molecular structure ; Pyridines ; Solvents
Publicat a:	Crystal Growth and Design, Vol. 22, Issue 7 (July 2022) , p. 4463-4471, ISSN 1528-7505

DOI: 10.1021/acs.cgd.2c00406

Article 9 p, 2.6 MB

Informació de suport 20 p, 1.8 MB

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