Catégorie d'actualités : UMR8004 IMAP

IMAP 2021 Webinar series
13th of July 2021 at 2pm
Online on Zoom
https://us02web.zoom.us/j/84719725729?pwd=UUl2bHRDcWJaQnpLNzRsS3JyeDlHQT09
Meeting ID: 8847 1972 5729
Secret code: jwHG3k

Assembling Designer Solids from Molecular Building Blocks: Principles, Prospects, and Problems

Prof. Christof Wöll
Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology, North Campus, 76021 Karlsruhe, FRG

Realizing molecular “Designer Solids” by programmed assembly of building units taken form libraries is a very appealing objective. Recently, metal-organic frameworks (MOFs) have attracted a huge interest in this context. Here, we will focus on MOF-based electrochemical, photoelectron-chemical, photovoltaic, and sensor devices. Internal interfaces in MOF heterostructures are also of interest with regard to photon-upconversion and the fabrication of diodes.
Since the fabrication of reliable and reproducible contacts to MOF-materials represent a major challenge, we have developed a layer-by-layer (lbl) deposition method to produce well-defined, highly oriented and monolithic MOF thin films on appropriately functionalized substrates. The resulting films are referred to as SURMOFs [1,2] and have very appealing properties in particular with regard to optical applications [3]. The fabrication of hetero-multilayers (see Fig. 1) is rather straightforward with this lbl method. In this talk, we will describe the principles of SURMOF fabrication as well as the results of systematic investigations of electrical and photophysical properties exhibited by empty MOFs and after loading their pores with functional guests. We will close with discussing further applications [4] realized by loading MOFs with nanoparticles or quantum dots.
References:
[1]J. Liu, Ch. Wöll, Chem. Soc. Rev. 46, 5730-5770 (2017)
[2]L. Heinke, Ch. Wöll, Adv. Mater. 31 (26), 1970184 (2019)
[3]R. Haldar, L. Heinke, Ch. Wöll, Adv.Mater. 32, 1905, (2020)
[4]A. Chandresh, X. Liu, Ch. Wöll, L. Heinke, Adv. Sci.,8, 2001884 (2021)

IMAP 2021 Webinar series
29th of June 2021 at 2pm

Online on Zoom
https://us02web.zoom.us/j/84312479733?pwd=ZUhSUVh1WFBnQVhRQnJTZmIvVnVzUT09
Meeting ID: 843 1247 9733
Secret code: K3nwq9

Tuning Properties and Functionality in the Modulated Self-Assembly of Metal-Organic Frameworks

Prof. Ross S. Forgan
WestCHEM School of Chemistry, University of Glasgow

Metal-organic frameworks (MOFs) are network materials comprised of organic ligands connected by metal ion clusters into multidimensional structures that often have permanent porosity. Their chemically addressable structures, combined with their ability to store large quantities of small molecules within their pores, have led to applications in gas storage, heterogeneous catalysis, sensing, and drug delivery, amongst others. Coordination modulation, the addition of monomeric modulators to synthetic mixtures, can tune particle size from nanometres to centimetres, through capping of crystallites (decreasing size) or coordinative competition with ligands (increasing size).
The talk will cover the development of our own modulation techniques for a range of trivalent and tetravalent MOFs, describing the versatility of modulation in controlling physical properties such as interpenetration, defectivity, and porosity.1 Our techniques provide access to high quality single crystals of many different MOFs, allowing the subsequent characterisation of their mechanical properties,2 flexibility upon guest uptake,3 single-crystal to single-crystal postsynthetic modification,4 and development of fluorescent sensors.5 Additionally, we will show that protocols can be tuned to downsize materials, producing nanoparticles with fine control of surface chemistry, allowing the assembly of pH-responsive6 and organelle targeted7 drug delivery devices.

1Marshall, R. J. et al., J. Mater. Chem. A 2018, 6, 1181–1187.
2Hobday, C. L. et al., Angew. Chem. Int. Ed. 2016 55, 2401–2405.
3Marshall, R. J.; McGuire, J.; Wilson, C.; Forgan, R. S. Supramol. Chem. 2018, 30, 124–133.
4Marshall, R. J.; Griffin, S. L.; Wilson, C; Forgan, R. S. J. Am. Chem. Soc. 2015, 137, 9527–9530.
5Marshall, R. J. et al., J. Am. Chem. Soc. 2017, 139, 6253–6260; Sussardi, A. et al., Angew. Chem. Int. Ed. 2020, 59, 8118–8122
6Abánades Lázaro, I. et al., Chem 2017, 2, 561–578.
7Haddad, S. et al., J. Am. Chem. Soc. 2020, 142, 6661–6674.

IMAP 2021 Webinar series
3rd of June 2021 at 4pm

Taking a New Solid CO2 Sorbent from Discovery to Commercialization

Prof. George Shimizu
Department of Chemistry, University of Calgary, Canada

Metal-organic frameworks (MOFs) are transcending from fundamental to applied research, but their use in a large-scale process has not been realized. For carbon capture, solid sorbents face a challenge of merging efficient capture with economical regeneration in a durable, scalable material. This presentation will discuss the molecular features that impact CO2 capture in porous solids and then present a case study of a MOF, Calgary Framework CALF20 that has progressed to industrial use for CO2 capture. CALF20 satisfies all key capture criteria while having a low regeneration penalty, durability and demonstrated scalability.

Online (contact antoine.tissot@ens.psl.eu for registration)