20.500.12556/DiRROS-27572 Copper(II) bromide complexes crystal structures, magnetic properties, and hydrogen-bond-mediated exchange Copper(II) compounds exhibit interesting magnetic properties due to halide–halide, copper–halide, and intermolecular hydrogen bond interactions. In this study, seven new copper(II) bromide complexes were synthesised, six of which contain Dabco (1,4-diazabicyclo[2.2.2]octane) as a ligand. Single-crystal X-ray diffraction data were refined using both conventional spherical-atom models and a non-spherical-atom approach implemented in NoSpherA2. Magnetic properties were investigated by temperature-dependent magnetic susceptibility and field-dependent magnetisation measurements, analysed using a molecular field approximation. Crystallographic analysis shows that NoSpherA2 significantly improves the description of hydrogen atom positions, yielding C–H and N–H bond lengths closer to neutron diffraction values than conventional refinement. Magnetic measurements indicate that interactions between mononuclear copper(II) centres are determined primarily by the nature of intermolecular exchange pathways rather than copper–copper separations alone. Despite comparable Cu···Cu distances, complexes lacking N–H···Br hydrogen bonds exhibit only weak antiferromagnetic interactions, whereas stronger coupling, effective up to 150 K, is observed when such hydrogen bonds connect neighbouring complexes. These results highlight the importance of hydrogen-bond topology and three-dimensional connectivity in governing magnetic behaviour in mononuclear copper(II) systems. copper(II) complexes bakrovi (II) kompleksi true false true MDPI Švica Angleški jezik Slovenski jezik © 2026 by the authors Neznano 2026-02-13 14:18:42 2026-02-13 14:18:43 2026-02-14 04:04:01 0000-00-00 00:00:00 2026 0 0 Nasl. z nasl. zaslona; Opis vira z dne 13. 2. 2026; str. 1-19 iss. 2, [article no.] 54 Vol. 14 Feb. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2026-01-20 2026-02-08 2026-02-11 546 2304-6740 10.3390/inorganics14020054 268417027 https://www.mdpi.com/2304-6740/14/2/54 1 86705ea7-08de-11f1-bcbc-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=40408 RAZ_Zakosek_Zan_2026.pdf RAZ_Zakosek_Zan_2026.pdf 1 91612EE8F34DA9BE78B08CE41D2D8D80 70c4473f60189c3d12dfa12170b91edcf265d336eb9d6a294f11f7ad2bda8a28 66fd156e-08df-11f1-bcbc-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=40411 Institut Jožef Stefan 0 0 0