Chemically Resistant, Shapeable, and Conducting Metal-Organic Gels and Aerogels Built from Dithiooxamidato Ligand

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Autor/in:
Erscheinungsjahr:
2017
Medientyp:
Text
Schlagworte:
  • aerogels
  • metal-organic frameworks
  • metal-organic gel
  • porosity
  • stimuli-responsive material
Beschreibung:
  • Metal-organic gels (MOGs) appear as a blooming alternative to well-known metal-organic frameworks (MOFs). Porosity of MOGs has a microstructural origin and not strictly crystalline like in MOFs; therefore, gelation may provide porosity to any metal-organic system, including those with interesting properties but without a porous crystalline structure. The easy and straightforward shaping of MOGs contrasts with the need of binders for MOFs. In this contribution, a series of MOGs based on the assembly of 1D-coordination polymer nanofibers of formula [M(DTA)] n (M II : Ni, Cu, Pd; DTA: dithiooxamidato) are reported, in which properties such as porosity, chemical inertness, mechanical robustness, and stimuli-responsive electrical conductivity are brought together. The strength of the MS bond confers an unusual chemical resistance, withstanding exposure to acids, alkalis, and mild oxidizing/reducing chemicals. Supercritical drying of MOGs provides ultralight metal-organic aerogels (MOAs) with densities as low as 0.03 g cm −3 and plastic/brittle behavior depending on the nanofiber aspect ratio. Conductivity measurements reveal a semiconducting behavior (10 −12 to 10 −7 S cm −1 at 298 K) that can be improved by doping (10 −5 S cm −1 ). Moreover, it must be stressed that conductivity of MOAs reversibly increases (up to 10 −5 S cm −1 ) under the presence of acetic acid.
Lizenz:
  • info:eu-repo/semantics/restrictedAccess
Quellsystem:
Forschungsinformationssystem der UHH

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oai:www.edit.fis.uni-hamburg.de:publications/4f376ae2-859c-4e15-9ab0-9461ad1076f9