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1 april 2026, 10h00, Amphithéâtre, Séminaire-invité, Dirk VOLMER (Augsburg university) , Functional K3,3 (Kuratowski) Building Units in Materials Chemistry: Past, Present, and Future, Mots clés : Metal-Organic frameworks, coordination chemistry, functional materials .

The first metal-organic framework (MFU-4, Metal-organic Framework Ulm University) comprising “Kuratowski-type” coordination units was reported in 2009.[1] Its strictly orthogonal geometry has inspired chemists to develop a diverse range of functional materials. Owing to a combination of nano-sized cavities and ultra-narrow pores, MFU-4 features kinetic gas trapping allowing for quantum sieving of light hydrogen isotopologues,[2] or high-capacity/slow-release entrapment of noble gas atoms.[3] Gas-specific uptake rates allowed us to construct the first MOF@SAW surface acoustic wave-based sensor.[4] In contrast to MFU-4, the isoreticular MFU-4l(arge) features framework-anchored metal sites resembling the iconic scorpionate complexes (Fig.1).[5] CuI -MFU-4l shows reversible chemisorption of O2, N2, and H2 with record-breaking isosteric heats of adsorption of 32–53 kJ mol−1 .[6] Biomemetic generation of catalytically active FeIV═O species in Fe-exchanged MFU-4l has recently been demonstrated by Hou et al.,[7] indicating the huge potential of MFU-4-type metal–organic frameworks as catalytic materials. Apart from the above mentioned applications, framework materials containing Kuratowski-type building units, such as simple M(II)-triazolate frameworks, often show fascinating physical properties, ranging from cooperative large-hysteresis spin-crossover in [FeII(ta)2] to spin-liquid behaviour in [MnII(ta)2], to name only a few examples.[8, 9] Research activities in our group have recently turned to photoactive metal complexes and frameworks for which the programmable self-assembly of K3,3 units offers an efficient bottom-up approach toward artificial photoantenna systems. Back.