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Gold(I)\u2010NHC complexes are known to emit green to yellow color, while blue emission is limited. Herewith, we report the photoluminescence and thermal stability correlation between blue emitting mononuclear gold(I)\u2010NHC chloride complexes, <jats:italic>N<\/jats:italic>\u2010(9\u2010anthracenyl)\u2010<jats:italic>N<\/jats:italic>\u2019(<jats:italic>n<\/jats:italic>\u2010alkyl)imidazol\u20102\u2010ylidene gold(I) chloride (alkyl=<jats:italic>n<\/jats:italic>\u2010butyl (<jats:bold>1<\/jats:bold>), <jats:italic>n<\/jats:italic>\u2010pentyl (<jats:bold>2<\/jats:bold>), <jats:italic>n<\/jats:italic>\u2010hexyl (<jats:bold>3<\/jats:bold>)). These complexes were synthesized by transmetallation route and characterized by FT\u2010IR, NMR, TGA, and single crystal X\u2010ray diffraction analysis. The solid\u2010state study reveals a unique molecular packing due to hydrogen bonding, aurophilic interaction, and CH\u22c5\u22c5\u22c5<jats:italic>\u03c0<\/jats:italic> interactions in all <jats:bold>1\u20133<\/jats:bold>. In addition, the <jats:italic>\u03c0\u22c5\u22c5\u22c5\u03c0<\/jats:italic> stacking has been found in <jats:bold>1<\/jats:bold>. All these complexes show good thermal stability due to the strong metal\u2010ligand bond strength along with crystal packing. In addition, <jats:bold>1<\/jats:bold>\u2013<jats:bold>3<\/jats:bold> emits a blue colour in both solution and crystalline state. The quantum yield in the crystalline state was found to be higher for <jats:bold>1<\/jats:bold> (22.44\u2009%) compared to <jats:bold>2<\/jats:bold> (9.90\u2009%), and <jats:bold>3<\/jats:bold> (14.98\u2009%). A similar high quantum yield for blue\u2010emitting gold(I)\u2010NHC chloride complex is rare. This promising quantum yield for <jats:bold>1<\/jats:bold> can be ascribed to the crystal packing effect. The theoretical calculations were carried out to understand the electronic and structural properties of <jats:bold>1<\/jats:bold>\u2013<jats:bold>3<\/jats:bold>. Computational studies revealed the origin of the luminescence behaviour of complexes. The blue light emitting thin film and LED are demonstrated using <jats:bold>1<\/jats:bold> exhibited the emission peak at the blue region with Commission Internationale de L'Eclairage (CIE) coordinates near the National Television Standards Committee (NTSC) value.<\/jats:p>","DOI":"10.1002\/asia.202401356","type":"journal-article","created":{"date-parts":[[2025,1,2]],"date-time":"2025-01-02T12:35:44Z","timestamp":1735821344000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["<i>N<\/i>\u2010Alkyl Chain Induced Molecular Aggregation in Mononuclear Gold(I)\u2010<i>N<\/i>\u2010Heterocyclic Carbene Complexes for Blue Light Emitting Applications"],"prefix":"10.1002","volume":"20","author":[{"given":"Gopendra","family":"Muduli","sequence":"first","affiliation":[{"name":"Organometallics and Materials Chemistry Lab Department of Chemistry Indian Institute of Technology Hyderabad, Kandi  Sangareddy 502285, Telangana India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Moulali","family":"Vaddamanu","sequence":"additional","affiliation":[{"name":"Organometallics and Materials Chemistry Lab Department of Chemistry Indian Institute of Technology Hyderabad, Kandi  Sangareddy 502285, Telangana India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arruri","family":"Sathyanarayana","sequence":"additional","affiliation":[{"name":"Laboratory of Polymer Materials Chemistry, Department of Applied Chemistry, College of Life Science Ritsumeikan University  Kusatsu 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kumar","family":"Siddhant","sequence":"additional","affiliation":[{"name":"Laboratory of Polymer Materials Chemistry, Department of Applied Chemistry, College of Life Science Ritsumeikan University  Kusatsu 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arushi","family":"Rawat","sequence":"additional","affiliation":[{"name":"Laboratory of Polymer Materials Chemistry, Department of Applied Chemistry, College of Life Science Ritsumeikan University  Kusatsu 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyohei","family":"Hisano","sequence":"additional","affiliation":[{"name":"Laboratory of Polymer Materials Chemistry, Department of Applied Chemistry, College of Life Science Ritsumeikan University  Kusatsu 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Osamu","family":"Tsutsumi","sequence":"additional","affiliation":[{"name":"Laboratory of Polymer Materials Chemistry, Department of Applied Chemistry, College of Life Science Ritsumeikan University  Kusatsu 525-8577 Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1772-135X","authenticated-orcid":false,"given":"Ganesan","family":"Prabusankar","sequence":"additional","affiliation":[{"name":"Organometallics and Materials Chemistry Lab Department of Chemistry Indian Institute of Technology Hyderabad, Kandi  Sangareddy 502285, Telangana India"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,1,13]]},"reference":[{"key":"e_1_2_8_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ccr.2017.09.011"},{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.2c00206"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja401523x"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1039\/C3CS60466G"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1039\/C3DT52146J"},{"key":"e_1_2_8_6_1","first-page":"61","author":"Feng X.","year":"2022","journal-title":"Angew. 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