{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,14]],"date-time":"2025-11-14T11:53:11Z","timestamp":1763121191724,"version":"3.45.0"},"reference-count":99,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2025,11,14]],"date-time":"2025-11-14T00:00:00Z","timestamp":1763078400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>The synthesis and characterization of two new complexes, namely Pt(1,3-bis(4-(4-hexyl-2-thienyl)-pyridin-2-yl)-5-mesitylbenzene)Cl and Pt(1,3-bis(4-(4-hexyl-2-thienyl)-pyridin-2-yl)-5-(2-thienyl)benzene)Cl, are reported. Both exhibit luminescence quantum yields approaching unity (\u03a6lum = 0.96\u20130.99) in the green region of the visible spectrum (534\u2013554 nm) in diluted degassed dichloromethane solution. Similarly to other N^C^N platinum(II) complexes, a broad emission band grows in the deep red region (738\u2013752 nm) upon increasing the concentration, due to the creation of bi-molecular emissive excited states. Interestingly, it appears that the introduction of a 2-thienyl group on the pyridine rings is a route to maintain excellent quantum yields even in concentrated solution. In order to have an insight into the electronic properties of the novel compounds, density functional theory (DFT) and time-dependent (TD)DFT approaches were employed to calculate the molecular geometry, the ground state, the electronic structure and the excited electronic states of the complexes, both as a monomers and dimers in solution.<\/jats:p>","DOI":"10.3390\/molecules30224410","type":"journal-article","created":{"date-parts":[[2025,11,14]],"date-time":"2025-11-14T11:49:43Z","timestamp":1763120983000},"page":"4410","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Introduction of a 4-Hexyl-2-thienyl Substituent on Pyridine Rings as a Route for Brightly Luminescent 1,3-Di-(2-pyridyl)benzene Platinum(II) Complexes"],"prefix":"10.3390","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8004-3200","authenticated-orcid":false,"given":"Alessia","family":"Colombo","sequence":"first","affiliation":[{"name":"UdR INSTM di Milano, Dipartimento di Chimica, Universit\u00e0 degli Studi di Milano, via C. Golgi 19, 20133 Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0106-0860","authenticated-orcid":false,"given":"Claudia","family":"Dragonetti","sequence":"additional","affiliation":[{"name":"UdR INSTM di Milano, Dipartimento di Chimica, Universit\u00e0 degli Studi di Milano, via C. Golgi 19, 20133 Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3425-6106","authenticated-orcid":false,"given":"Francesco","family":"Fagnani","sequence":"additional","affiliation":[{"name":"UdR INSTM di Milano, Dipartimento di Chimica, Universit\u00e0 degli Studi di Milano, via C. Golgi 19, 20133 Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9659-4760","authenticated-orcid":false,"given":"Dominique","family":"Roberto","sequence":"additional","affiliation":[{"name":"UdR INSTM di Milano, Dipartimento di Chimica, Universit\u00e0 degli Studi di Milano, via C. Golgi 19, 20133 Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5478-5216","authenticated-orcid":false,"given":"Simona","family":"Fantacci","sequence":"additional","affiliation":[{"name":"Computational Laboratory for Hybrid\/Organic Photovoltaics (CLHYO), Istituto di Scienze e Tecnologie Chimiche \u201cGiulio Natta\u201d SCITEC, Consiglio Nazionale delle Ricerche (CNR), via Elce di Sotto 8, 06213 Perugia, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4490-8825","authenticated-orcid":false,"given":"Daniele","family":"Marinotto","sequence":"additional","affiliation":[{"name":"Istituto di Scienze e Tecnologie Chimiche (SCITEC) \u201cGiulio Natta\u201d, Consiglio Nazionale delle Ricerche (CNR), via C. Golgi 19, 20133 Milan, Italy"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,11,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"334","DOI":"10.1016\/j.jphotochem.2017.09.008","article-title":"Immobilization of luminescent Platinum(II) complexes on periodic mesoporous organosilica and their water reduction photocatalysis","volume":"358","author":"Yoshida","year":"2018","journal-title":"J. Photochem. Photobiol. A"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"13845","DOI":"10.1021\/acs.inorgchem.0c01326","article-title":"Photocatalytic water-soluble cationic platinum(II) complexes bearing quinolinate and phosphine ligands","volume":"59","author":"Marzo","year":"2020","journal-title":"Inorg. 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