http://hdl.handle.net/11089/2 2026-04-06T05:32:01Z http://hdl.handle.net/11089/57802 Photochemical synthesis of carbazole-fused Blatter radicals: effective spin injection to the carbazole system Bartos, Paulina; Szamweber, Patrycja; Camargo, Bruno; Pietrzak, Anna; Kaszyński, Piotr Photocyclization of N-substituted carbazole derivatives of benzo[e][1,2,4]triazine gave two carbazole-fused Blatter radicals with a novel heterocyclic skeleton. No photocyclization was observed for the analogous dibenzocarbazole, indole, benzimidazole, and phenoxazine precursors, which was rationalized with DFT computational methods. The two carbazole-derived radicals were characterized by spectroscopic (UV- vis, EPR) and electrochemical methods, while one of them was analyzed structurally (XRD) and magnetically (SQUID). The latter analysis revealed ferromagnetic interactions in the solid state with 2J/kB = 16.6 K. Properties of these first examples of a new class of stable radicals were analyzed with DFT methods, which confirmed significant impact of the peri-nitrogen atom on electronic properties and additional 15% spin delocalization. 2025-05-27T00:00:00Z http://hdl.handle.net/11089/57801 Ladder-Type Cu(II) Coordination Polymer with π−π Stacking of Planar Blatter Radical Ligands: Structural and Magnetic Characterization Singh, Hemant K.; Smith, Kayla M.; Rawson, Jeremy M.; Camargo, Bruno; Pollett, Ethan S.; Hietsoi, Oleksandr; Friedli, Andrienne C.; Kaszynski, Piotr The synthesis of two C(2)-pyridyl derivatives of the planar Blatter radical was developed by using the tris(trimethylsilyl)silane (TTMSS)-assisted cyclization of appropriate iodoarenes. These monodentate paramagnetic ligands were characterized by spectroscopic (UV−vis and electron paramagnetic resonance (EPR)) and electrochemical methods and reacted with (pdc)Cu(H2O)3. A complex containing the 3-pyridyl group was characterized structurally, revealing novel polymeric Cu−O−Cu−O ladders separated with slipped stacks of radical ligands. Superconducting quantum interference device (SQUID) magnetometry of this complex demonstrated strong antiferromagnetic interactions between the radicals and largely isolated Cu(II) ions. Analysis of the magnetic data with the Hatfield model, assuming two isolated one-dimensional (1D) alternating Heisenberg chains, gave JRR/kB = −1200 K and αRR = 0.4 for the paramagnetic ligand stacks, and JCuCu/ kB = −3.5 K and αCuCu = 0.9 for the Cu(II) ion chains. Analysis of the experimental data was augmented with density functional theory (DFT) calculations. 2025-09-17T00:00:00Z http://hdl.handle.net/11089/57734 Dataset for publication_Molecules 2025(30)4651_funded by National Science Center, Poland 2021/41/N/ST4/01425 Koszelska, Kamila; Świderski, Michał; Seroka, Jagoda; Guziejewski, Dariusz; Krzymiński, Paweł; Miniak-Górecka, Alicja; Ullah, Nabi; Smarzewska, Sylwia The study focused on evaluating the effect of electrode surface preparation on electrochemical measurements. In particular, the influence of different polishing protocols applied to carbon electrodes was investigated with respect to the electroactive surface area and the repeatability of the electrochemical response. The mechanical cleaning procedure of the solid disc electrode was systematically examined by testing various polishing motions and numbers of repetitions. The results demonstrated that the polishing method significantly affects both the electroactive surface area and measurement repeatability. The highest surface area and best repeatability were achieved using an “8-shaped” polishing motion. These findings confirm that electrode surface preparation plays a critical role in obtaining reliable and reproducible electroanalytical data. Dane badawcze powiązane z publikacją: Publikacja1. Świderski, M.; Seroka, J.; Guziejewski, D.; Krzymiński, P.; Miniak-Górecka, A.; Koszelska, K.; Ullah, N.; Smarzewska, S. Influence of Electrode Polishing Protocols, Potentiostat Models, and LOD Calculation Methods on the Electroanalytical Performance of SWV Measurements at Glassy Carbon Electrodes. Molecules 2025, 30, 4651. https://doi.org/10.3390/molecules30234651 In the file, measurement data obtained during voltammetric studies are provided. They present analyses carried out using different potentiostats, as well as various electrode surface renewal (cleaning/polishing) methods. 2025-01-01T00:00:00Z http://hdl.handle.net/11089/57733 Dataset for publication_Eng. Proc. 2023(48)65_funded by the National Science Center, Cracow, Poland (Grant no. 2021/41/N/ST4/01425) Machura, Gabriela; Seroka, Jagoda; Smarzewska, Sylwia; Koszelska, Kamila This study focused on the optimization of adrenaline electrografting onto a glassy carbon electrode using cyclic voltammetry in an acidic solution. A stable layer was obtained after multiple potential scans and characterized by square wave voltammetry. The results confirmed the successful formation of a stable adrenaline film on the electrode surface. Furthermore, the immobilized layer exhibited sensitivity to selected metal cations, as evidenced by a decrease in the adrenaline signal after exposure, indicating its potential application in indirect cation detection. The file contains measurement data obtained during voltammetric studies. It presents data collected during the deposition of adrenaline on the electrode surface and the subsequent optimization of this process. Additionally, it includes data aimed at verifying the sensitivity of the immobilized layer to the presence of Mg²⁺ and Ca²⁺ ions. 2023-01-01T00:00:00Z