| 研究実績の概要 |
Based on the former research results, we have proposed to prepare a guest@MOF charge transfer complexes using a spontaneous "crystal sponge" method, based on the Mn-AQDC MOF that was developed by our group. Two guest@MOF charge transfer complexes have been prepared using this method, namely 5TTF@Mn-MOF and 7TMPDA@Mn-MOF. The crystal structure could be obtained via a crystal-to-crystal transformation and we observed the charge transfer interaction between the donors and acceptor groups on the MOF. A series of characterization has been performed to illustrate the charge transfer phenomena, including IR, Raman spectrum, reflectance spectrum, EPR and magnetism. The charge transfer degree and the valences of organic donors were estimated.
On the other hand, we examined the application of UiO-6X(X=6,7,8)MOFs being the sulfur carriers in a lithium-sulfur battery. A clear effect of variable pore size and pore volumes have been observed. Smaller pores in UiO-66 significantly restricted the diffusion of polysulfide anions in the second step, therefore the rate-dependent CV suggested an apparent shift of the second reduction peak. While in the case of UiO-67 and UiO-68, both reduction peaks shifted at a same degree, suggesting the main factor here is the poor conductivity and large particle size.
The first part of work will be summarized and published soon.
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