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Single-crystal analysis reveals a distorted octahedral Co4 framework interconnected through oxygen-bridged pathways and reinforced by cooperative O\u2013H\u00b7\u00b7\u00b7O hydrogen bonding, \u03c0\u2013\u03c0 stacking, and C\u2013H\u00b7\u00b7\u00b7\u03c0 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\u2013orbit 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.<\/jats:p>","DOI":"10.1021\/acs.jpca.6c05412","type":"journal-article","created":{"date-parts":[[2026,9,19]],"date-time":"2026-09-19T17:01:31Z","timestamp":1789837291000},"page":"7844-7851","source":"Crossref","is-referenced-by-count":0,"title":["A Tetrameric Cobalt(II)\nAssembly Integrating Aggregation-Induced\nEmission and Weak Antiferromagnetic Coupling"],"prefix":"10.1021","volume":"130","author":[{"given":"Sharsti","family":"Goyal","sequence":"first","affiliation":[{"name":"Malaviya National Institute of Technology (MNIT) , , ,","place":["Jaipur, India, 302017"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1232-4489","authenticated-orcid":true,"given":"Sakshi","family":"Mehta","sequence":"additional","affiliation":[{"name":"Indian Institute of Science , , Sir C V Raman Road , ,","place":["Bangalore, India, 560012"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-3597-3733","authenticated-orcid":true,"given":"Shashank Kumar","family":"Mishra","sequence":"additional","affiliation":[{"name":"Malaviya National Institute of Technology (MNIT) , , ,","place":["Jaipur, India, 302017"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1440-9590","authenticated-orcid":true,"given":"Abhineet","family":"Verma","sequence":"additional","affiliation":[{"name":"Malaviya National Institute of Technology (MNIT) , , ,","place":["Jaipur, India, 302017"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,19]]},"reference":[{"issue":"9","key":"2026102810064058000_cit1","doi-asserted-by":"publisher","first-page":"8960","DOI":"10.1021\/acsnano.5b02840","article-title":"Highly Efficient Thermal and Light-Induced Spin-State Switching of\nan Fe(II) Complex in Direct Contact with a Solid Surface","volume":"9","author":"Bernien","year":"2015","journal-title":"ACS Nano"},{"key":"2026102810064058000_cit2","doi-asserted-by":"publisher","first-page":"342","DOI":"10.3762\/bjoc.9.39","article-title":"Spin State\nSwitching in Iron Coordination\nCompounds","volume":"9","author":"Gu\u0308tlich","year":"2013","journal-title":"Beilstein J. 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