2026-10-14T05:51:18Z https://api.figshare.com/v2/oai

oai:figshare.com:article/33943050 2026-09-19T16:16:35Z category_1 category_4 category_915 category_12 category_14 category_19 category_21 category_873 category_64 portal_63 item_type_3 month_year_09_2026

A Tetrameric Cobalt(II) Assembly Integrating Aggregation-Induced Emission and Weak Antiferromagnetic Coupling Sharsti Goyal (22784826) Sakshi Mehta (8810447) Shashank Kumar Mishra (8723085) Abhineet Verma (5644841) Biophysics Biochemistry Physical Sciences not elsewhere classified Cell Biology Molecular Biology Pharmacology Biotechnology Chemical Sciences not elsewhere classified Cancer – h ··· weak antiferromagnetic coupling supramolecular organization within rapid magnetization dynamics present study demonstrates multinuclear 3d systems like supramolecular arrangement crystal analysis reveals magnetic exchange interactions distorted octahedral co cooperative structural rigidification 4 </ sub assembly integrating aggregation spin co magnetic communication viable strategy tetrameric cobalt state modulation state confinement pronounced aggregation progressive aggregation molecule magnets induced emission hydrogen bonding governed excited framework interconnected extended caterpillar emissive enhancement controlled photophysics confirming aggregation bridged pathways aggregate growth A supramolecularly rigidified tetrameric cobalt(II) assembly, [Co4T8(H2O)2] (T-Co), where T = Tropolonate ion, has been constructed using tropolonate ligands to investigate the interplay between aggregation-controlled photophysics and magnetic exchange interactions in multinuclear 3d systems. Single-crystal analysis reveals a distorted octahedral Co4 framework interconnected through oxygen-bridged pathways and reinforced by cooperative O–H···O hydrogen bonding, π–π stacking, and C–H···π interactions, producing an extended caterpillar-like supramolecular arrangement. The restricted structural dynamics imposed by this densely packed architecture give rise to pronounced aggregation-induced emission (AIE) behavior, in which progressive aggregation in water-rich media enhances fluorescence by suppressing nonradiative relaxation channels. Dynamic light scattering measurements correlate the emissive enhancement with aggregate growth, confirming aggregation-governed excited-state modulation. Magnetic studies reveal weak antiferromagnetic exchange between high-spin Co(II) centers, accompanied by pronounced single-ion magnetic anisotropy arising from spin–orbit coupling and rapid magnetization dynamics, although slow magnetic relaxation characteristic of robust single-molecule magnets is not observed. The present study demonstrates how supramolecular organization within a polynuclear cobalt framework simultaneously dictates excited-state confinement and magnetic communication, providing a viable strategy for engineering multifunctional luminescent magnetic materials through cooperative structural rigidification. 2026-09-19T00:00:00Z Dataset Dataset 10.1021/acs.jpca.6c05412.s003 https://figshare.com/articles/dataset/A_Tetrameric_Cobalt_II_Assembly_Integrating_Aggregation-Induced_Emission_and_Weak_Antiferromagnetic_Coupling/33943050 CC BY-NC 4.0