{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Soejima K"],"funding":["Iketani Science and Technology Foundation","Ministry of Education, Culture, Sports, Science and Technology","Kumamoto University","Japan Society for the Promotion of Science"],"pagination":["35892-35898"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC12477679"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["15(43)"],"pubmed_abstract":["Exploring new compounds that exhibit spin-state switching under external stimuli is crucial for advancing materials science. However, the feasibility of combining π-conjugated moieties with Co(ii)-terpy cation units <i>via</i> an ethynyl group has not yet been investigated. This approach represents a hybridization strategy wherein distinct functional moieties are incorporated into a single coordination metal complex to achieve multifunctionality. In this study, we synthesised a series of Co(ii)-terpyridine complexes [Co(R-ethynyl-terpy)<sub>2</sub>](BF<sub>4</sub>)<sub>2</sub> (R = phenyl for 1, naphthyl for 2, anthracenyl for 3, and pyrenyl for 4), resolved their crystal structures and packing arrangements, and evaluated their magnetic properties using a superconducting quantum interference device magnetometer. These Co(ii)-based complexes exhibited thermal spin-crossover behaviour in the solid state. Although complexes 1-4 were luminescent in solution, only complexes 3 and 4 emitted dual monomer and excimer fluorescence in solution due to their substituted π-conjugated moieties. Our findings are expected to serve as a platform for the synthesis of magnetically functional coordination metal compounds based on Co(ii) ions for the potential development of photophysical materials."],"journal":["RSC advances"],"pubmed_title":["Observation of spin-crossover behaviour in Co(ii)-terpyridine complexes possessing π-conjugated substations."],"pmcid":["PMC12477679"],"funding_grant_id":["JP24K01502","JPMXS0320200363","JP24K08449"],"pubmed_authors":["Zenno H","Soejima K","Miyake K","Hayami S","Sekine Y","Kiba K","Yamaguchi Y"],"additional_accession":[]},"is_claimable":false,"name":"Observation of spin-crossover behaviour in Co(ii)-terpyridine complexes possessing π-conjugated substations.","description":"Exploring new compounds that exhibit spin-state switching under external stimuli is crucial for advancing materials science. However, the feasibility of combining π-conjugated moieties with Co(ii)-terpy cation units <i>via</i> an ethynyl group has not yet been investigated. This approach represents a hybridization strategy wherein distinct functional moieties are incorporated into a single coordination metal complex to achieve multifunctionality. In this study, we synthesised a series of Co(ii)-terpyridine complexes [Co(R-ethynyl-terpy)<sub>2</sub>](BF<sub>4</sub>)<sub>2</sub> (R = phenyl for 1, naphthyl for 2, anthracenyl for 3, and pyrenyl for 4), resolved their crystal structures and packing arrangements, and evaluated their magnetic properties using a superconducting quantum interference device magnetometer. These Co(ii)-based complexes exhibited thermal spin-crossover behaviour in the solid state. Although complexes 1-4 were luminescent in solution, only complexes 3 and 4 emitted dual monomer and excimer fluorescence in solution due to their substituted π-conjugated moieties. Our findings are expected to serve as a platform for the synthesis of magnetically functional coordination metal compounds based on Co(ii) ions for the potential development of photophysical materials.","dates":{"release":"2025-01-01T00:00:00Z","publication":"2025 Sep","modification":"2026-06-03T23:29:15.945Z","creation":"2026-05-03T03:11:14.849Z"},"accession":"S-EPMC12477679","cross_references":{"pubmed":["41030305"],"doi":["10.1039/d4ra08657k"]}}