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Stefan Hecht (born 6 January 1974) is a German chemist.
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Stefan Hecht (born 6 January 1974) is a German chemist.
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Hecht was born in 1974 in East Berlin. [1] He studied chemistry from 1992 to 1997 at the Humboldt-Universität zu Berlin and the University of California, Berkeley, where he carried out his diploma thesis research with the late William G. Dauben about "New Mechanistic Insight into the Lumiketone Rearrangement – Wavelength-Dependent Photochemistry of 4-Methoxybicyclo[3.1.0]hex-3-en-2-ones". [2] After his diploma in chemistry, he carried out his graduate work from 1997 to 2001 on the "Synthesis and Application of Functional Branched Macromolecules – From Site Isolation and Energy Harvesting to Catalysis" in the research group of Jean Fréchet at the University of California, Berkeley.
After his return to Germany in the fall of 2001, Hecht established his independent research program as one of the first Sofja Kovalevskaja Awardees, initially as a Young Investigator at the Freie Universität Berlin and since 2005 as group leader at the Max Planck Institute for Coal Research in Mülheim upon Ruhr. In the fall of 2006 he became the youngest W3-professor in chemistry in Germany and holder of the chair of organic chemistry and functional materials at Humboldt-Universität zu Berlin. From 2019 until 2022 he was the scientific director of the DWI – Leibniz Institute for Interactive Materials in Aachen and held the chair for macromolecular chemistry at RWTH Aachen University. Since the fall of 2022 he is Einstein Professor [3] at Humboldt-Universität zu Berlin and founding director of the Center for the Science of Materials Berlin (CSMB).
Hecht is co-founder of the start-up company xolo GmbH that has been developing and commercializing xolography as new volumetric 3D printing technology since 2019.
He is married and father of two adult daughters.
Hecht is a synthetic chemist with research interests that span from macromolecular and supramolecular chemistry over photochemistry and electrochemistry all the way to surface and interface phenomena. Particular focus of his work is on the development of photoswitchable molecules to optically control of physical, chemical, and biological processes and their application in materials, (opto)electronic devices, and additive manufacturing.
Together with Leonhard Grill, Hecht has pioneered the development of "On-Surface Polymerization" [4] [5] as a new precision synthesis method for 1D and 2D nanostructures, such as molecular wires, [6] graphene ribbons, and networks. [7]
Hecht has made several seminal contribution in the area of photochromism by significantly improving the properties of molecular photoswitches and by exploiting them in a variety of applications. For example, he could address azobenzene by an electric field [8] [9] or by electron/hole catalysis, [10] [11] establish ortho-fluoroazobenzenes as solely visible light switchable and thermally stable photoswitches, [12] develop extremely fatigue resistant diarylethenes [13] as well as photoswitches based on acylhydrazones [14] and indigos, [15] and moreover design dihydropyrenes that allow for single NIR photon switching. [16] [17] His photoswitches enable to control and drive various processes (folding, [18] [19] [20] reactivity, [21] [22] and catalysis [23] [24] [25] ), materials (self-healing [26] [27] and detection [28] [29] ), and devices (transistors, [30] memories, [31] displays [32] ) and actuators. [33]
Together with Martin Regehly he has invented xolography. [34] Xolography is a volumetric 3D printing method, which enables the rapid manufacturing of complex objects and entire systems directly in volume with high precision (resolution) and high material quality (homogeneous material with smooth surfaces). The technology and its application in additive manufacturing are being developed by the start-up company xolo GmbH, which he helped to co-found.
Azobenzene is a photoswitchable chemical compound composed of two phenyl rings linked by a N=N double bond. It is the simplest example of an aryl azo compound. The term 'azobenzene' or simply 'azo' is often used to refer to a wide class of similar compounds. These azo compounds are considered as derivatives of diazene (diimide), and are sometimes referred to as 'diazenes'. The diazenes absorb light strongly and are common dyes. Different classes of azo dyes exist, most notably the ones substituted with heteroaryl rings.
A polycatenane is a chemical substance that, like polymers, is chemically constituted by a large number of units. These units are made up of concatenated rings into a chain-like structure.
Molecular machines are a class of molecules typically described as an assembly of a discrete number of molecular components intended to produce mechanical movements in response to specific stimuli, mimicking macromolecular devices such as switches and motors. Naturally occurring or biological molecular machines are responsible for vital living processes such as DNA replication and ATP synthesis. Kinesins and ribosomes are examples of molecular machines, and they often take the form of multi-protein complexes. For the last several decades, scientists have attempted, with varying degrees of success, to miniaturize machines found in the macroscopic world. The first example of an artificial molecular machine (AMM) was reported in 1994, featuring a rotaxane with a ring and two different possible binding sites. In 2016 the Nobel Prize in Chemistry was awarded to Jean-Pierre Sauvage, Sir J. Fraser Stoddart, and Bernard L. Feringa for the design and synthesis of molecular machines.
Dynamic covalent chemistry (DCvC) is a synthetic strategy employed by chemists to make complex molecular and supramolecular assemblies from discrete molecular building blocks. DCvC has allowed access to complex assemblies such as covalent organic frameworks, molecular knots, polymers, and novel macrocycles. Not to be confused with dynamic combinatorial chemistry, DCvC concerns only covalent bonding interactions. As such, it only encompasses a subset of supramolecular chemistries.
A photoswitch is a type of molecule that can change its structural geometry and chemical properties upon irradiation with electromagnetic radiation. Although often used interchangeably with the term molecular machine, a switch does not perform work upon a change in its shape whereas a machine does. However, photochromic compounds are the necessary building blocks for light driven molecular motors and machines. Upon irradiation with light, photoisomerization about double bonds in the molecule can lead to changes in the cis- or trans- configuration. These photochromic molecules are being considered for a range of applications.
Covalent organic frameworks (COFs) are a class of porous polymers that form two- or three-dimensional structures through reactions between organic precursors resulting in strong, covalent bonds to afford porous, stable, and crystalline materials. COFs emerged as a field from the overarching domain of organic materials as researchers optimized both synthetic control and precursor selection. These improvements to coordination chemistry enabled non-porous and amorphous organic materials such as organic polymers to advance into the construction of porous, crystalline materials with rigid structures that granted exceptional material stability in a wide range of solvents and conditions. Through the development of reticular chemistry, precise synthetic control was achieved and resulted in ordered, nano-porous structures with highly preferential structural orientation and properties which could be synergistically enhanced and amplified. With judicious selection of COF secondary building units (SBUs), or precursors, the final structure could be predetermined, and modified with exceptional control enabling fine-tuning of emergent properties. This level of control facilitates the COF material to be designed, synthesized, and utilized in various applications, many times with metrics on scale or surpassing that of the current state-of-the-art approaches.
A two-dimensional polymer (2DP) is a sheet-like monomolecular macromolecule consisting of laterally connected repeat units with end groups along all edges. This recent definition of 2DP is based on Hermann Staudinger's polymer concept from the 1920s. According to this, covalent long chain molecules ("Makromoleküle") do exist and are composed of a sequence of linearly connected repeat units and end groups at both termini.
The Catellani reaction was discovered by Marta Catellani and co-workers in 1997. The reaction uses aryl iodides to perform bi- or tri-functionalization, including C-H functionalization of the unsubstituted ortho position(s), followed a terminating cross-coupling reaction at the ipso position. This cross-coupling cascade reaction depends on the ortho-directing transient mediator, norbornene.
Jürgen P. Rabe is a German physicist and nanoscientist.
Christopher Barner-Kowollik is a German-Australian materials scientist who is an Australian Research Council Laureate Fellow working in macromolecular photochemistry. He is currently Senior Deputy Vice-Chancellor and vice-president (Research) of the Queensland University of Technology (QUT) and Distinguished Professor within the School of Chemistry and Physics at the QUT in Brisbane. From 2017 to 2024 he was editor-in-chief of the Royal Society of Chemistry (RSC) journal Polymer Chemistry, and is an editor for the RSC's journal Chemical Science. He is a principal investigator within the Soft Matter Materials Laboratory at QUT and associate research group leader at the Karlsruhe Institute of Technology.
Corinna S. Schindler is a Professor of Chemistry at the University of Michigan. She develops catalytic reactions with environmentally benign metals such as iron, towards the synthesis of biologically active small molecules. For her research in the development of new catalysts, Schindler has been honored with several early-career researcher awards including the David and Lucile Packard Foundation Fellowship in 2016, the Alfred P. Sloan Fellowship in 2017, and being named a member of the C&EN Talented 12 in 2017. Schindler has served on the Editorial Board of Organic and Bimolecular Chemistry since 2018.
Bettina Valeska Lotsch is a German chemist. She is Director at the Max Planck Institute for Solid State Research in Stuttgart, Germany.
An Artificial Metalloenzyme (ArM) is a designer metalloprotein, not found in nature, which can catalyze desired chemical reactions. Despite fitting into classical enzyme categories, ArMs also have potential in new-to-nature chemical reactivity like catalysing Suzuki coupling, Metathesis etc., which were never reported among natural enzymatic reactions.
Helma B. Wennemers is a German organic chemist. She is a professor of organic chemistry at the Swiss Federal Institute of Technology in Zurich.
Jayaraman Sivaguru (Siva) is the Antonia and Marshall Wilson Professor of Chemistry and the Associate Director, Center for Photochemical Sciences at the Department of Chemistry, Bowling Green State University, Bowling Green, Ohio. He is a recipient of 2008 National Science Foundation CAREER Award, 2010 Grammaticakis-Neumann Prize from the Swiss Chemical Society, 2011 young-investigator award from the Inter-American Photochemical Society (I-APS), and 2012-young investigator award from Sigma Xi. His honors also include Excellence in Research award, 2011 Excellence in Teaching award, and the 2012 PeltierAward for Innovation in Teaching. Prof. Siaguru was a visiting young professor at the Global Centre for Excellence at Osaka University, Japan and was a visiting fellow for the Chinese Academy of Sciences President's International Fellowship Initiative in 2018. He is an editor for the Journal of Photochemistry and Photobiology A: Chemistry and from 2020 serves as the co-Editor-in-Chief of Journal of Photochemistry and Photobiology published by Elsevier. He is an international board member of the International Union of Pure and Applied Chemistry (IUPAC) photochemistry symposium.
Eric Meggers is a German chemist and professor of organic chemistry and chemical biology at the University of Marburg, Germany. His research currently focuses on the design of chiral catalysts for stereoselective synthesis.
Jieping Zhu is an organic chemist specializing in natural product total synthesis and organometallics. He is a professor of chemistry at EPFL and the head of the Laboratory of Synthesis and Natural Products.
Karsten Meyer is a German inorganic chemist and Chair of Inorganic and General Chemistry at the Friedrich-Alexander University of Erlangen-Nürnberg (FAU). His research involves the coordination chemistry of transition metals as well as uranium coordination chemistry, small molecule activation with these coordination complexes, and the synthesis of new chelating ligands. He is the 2017 recipient of the Elhuyar-Goldschmidt Award of the Spanish Royal Society of Chemistry, the Ludwig-Mond Award of the Royal Society of Chemistry, and the L.A. Chugaev Commemorative Medal of the Russian Academy of Sciences, among other awards. He also serves as an Associate Editor of the journal Organometallics since 2014.
Martin Albrecht is a Swiss chemist. He is Professor of Inorganic Chemistry at the Department of Chemistry, Biochemistry and Pharmacy at the University of Bern. He is known for his contribution to carbene chemistry, particularly with his work on 1,2,3-triazolylidene mesoionic carbene.
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