Jeremy J. Hrudka

Area of research

Materials Chemistry · Electronic, Optical and Magnetic Materials

Research interest

Research topics from publications: A Simple Approach for Predicting the Spin State of Homoleptic Fe(II) Tris-diimine Complexes; Ylidenemalononitrile Enamines as Fluorescent “Turn-On” Indicators for Primary Amines; Heteroleptic Fe(II) Complexes with N4S2 Coordination as a Platform for Designing Spin-Crossover Materials; Thermal Cycloisomerization of Putative Allenylpyridines for the Synthesis of Isoquinoline Derivatives; Power of Three: Incremental Increase in the Ligand Field Strength of N-Alkylated 2,2′-Biimidazoles Leads to Spin Crossover in Homoleptic Tris-Chelated Fe(II) Complexes; Abrupt Spin Transition in a Heteroleptic Fe(II) Complex with Pendant Naphthalene Functionality; Rapid-Flow Synthesis of Zn-Qn Complexes: Teaching Old Ligands New Tricks with Reactive Na2(HZnEt2)2; ChemInform Abstract: Thermal Cycloisomerization of Putative Allenylpyridines for the Synthesis of Isoquinoline Derivatives. Representative work: ion with chelating diimine ligands. The approach is based on the analysis of a single metric parameter within a free (noncoordinated) ligand: the interatomic separation between the N-donor metal-binding sites. An extensive analysis of existing complexes allows the determination of critical N···N distances that dictate the regions of stability for the high-spin and low-spin complexes, as well as the intermediate range in which the magnetic bistability (spin crossover) can be observed. The prediction has been tested on several complexes that demonstrate the validity of our method Ylidenemalononitrile enamines undergo rapid amine exchange followed by a cyclization with primary amines to yield fluorescent products with emission intensities as high as 900 times greater than the starting materials. After identifying the fluorescent species by X-ray crystallography, we demonstrate that the rate of amine exchange is substrate dependent and that by simple structural variation the fluorescence can be tuned over the entire visible spectrum. We further demonstrate their potential application in biomolecule labeling

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