{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,31]],"date-time":"2025-12-31T14:20:52Z","timestamp":1767190852545,"version":"3.48.0"},"reference-count":149,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2025,9,15]],"date-time":"2025-09-15T00:00:00Z","timestamp":1757894400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"crossref","award":["16655046 (FY2003\u20132005)"],"award-info":[{"award-number":["16655046 (FY2003\u20132005)"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100001691","name":"Japan Society for the Promotion of Science","doi-asserted-by":"crossref","award":["22350052 (FY2010\u20132013)"],"award-info":[{"award-number":["22350052 (FY2010\u20132013)"]}],"id":[{"id":"10.13039\/501100001691","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/100016985","name":"NAIST Foundation","doi-asserted-by":"publisher","award":["FY2009"],"award-info":[{"award-number":["FY2009"]}],"id":[{"id":"10.13039\/100016985","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100002241","name":"Japan Science and Technology Agency","doi-asserted-by":"crossref","award":["FY1998\u20132003"],"award-info":[{"award-number":["FY1998\u20132003"]}],"id":[{"id":"10.13039\/501100002241","id-type":"DOI","asserted-by":"crossref"}]},{"name":"NTT Basic Research Laboratory","award":["FY1994\u20131998"],"award-info":[{"award-number":["FY1994\u20131998"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>This paper comprehensively reports experimental proof of parity violation in the ground and photoexcited states of three mirror-symmetric Si\u2013Si bond polymers in homogeneous solutions of achiral molecules under non-stirring conditions by analyzing 370 chiroptical datasets relating to multiple second-order helix\u2013helix transitions in the circular dichroism (CD) of poly(di-i-butylsilane) (iBS), poly(di-i-pentylsilane) (iPS), and poly(di-i-hexylsilane) (iHS) in achiral alkanols and p-dioxane-h8\/-d8. Particularly large (\u2013)-CD of gabs = \u22123.1 \u00d7 10\u22122 at 290 nm was found for iBS in i-pentanol at 25 \u00b0C. Notably, iPS in n-propanol at \u22125 \u00b0C generated (\u2013)-CD with gabs = \u22120.48 \u00d7 10\u22122 at 300 nm, but (+)-circularly polarized luminescence (CPL) with glum = +0.84 \u00d7 10\u22122 at 326 nm. In contrast, iHS in n-octanol at 0 \u00b0C showed only very weak (\u2013)-CD of gabs ~\u22120.03 \u00d7 10\u22122 at 310 nm. The H\/D isotopes of p-dioxane-h8\/-d8 weakly affected the helix\u2013helix transition characteristics of iBS. (\u2013)-Sign vibrational CD signals assigned to the handed symmetric and asymmetric bending modes of the CH3 and CH2 groups of the solvents and other achiral molecules were observed. We assumed (i) three 1H nuclear-spin-1\/2 induced handed motions of CH3 rotors at i-alkyl side chains and achiral alkanols, and (ii) helical main-chain Si atoms (\u03b4+) coordinated by handed lone pairs at oxygen (\u03b4\u2212) in gauche-containing n- and i-alkanols induced by the CH3 rotors. A possible origin of biomolecular handedness is proposed based on the first observation of far-UV CD and UV spectra of zwitterionic glycine bearing H3N+ rotor in neutral H2O.<\/jats:p>","DOI":"10.3390\/sym17091544","type":"journal-article","created":{"date-parts":[[2025,9,15]],"date-time":"2025-09-15T16:27:33Z","timestamp":1757953653000},"page":"1544","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Broken Mirrors: Multiple Circular Polarization and Inversion in the Ground and Photoexcited States of Mirror-Symmetric Helical Poly(di-iso-alkylsilane)s in Achiral Molecular Solvents"],"prefix":"10.3390","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3139-9478","authenticated-orcid":false,"given":"Michiya","family":"Fujiki","sequence":"first","affiliation":[{"name":"Graduate School of Advanced Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma 630-0192, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takashi","family":"Mori","sequence":"additional","affiliation":[{"name":"Graduate School of Advanced Science and Technology, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma 630-0192, Nara, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julian R.","family":"Koe","sequence":"additional","affiliation":[{"name":"Department of Natural Sciences, International Christian University, 3-10-2 Osawa, Mitaka 181-8585, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0167-2610","authenticated-orcid":false,"given":"Mohamed Mehawed","family":"Abdellatif","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji 192-0397, Tokyo, Japan"},{"name":"Chemistry of Tanning Materials and Leather Technology Department, Chemical Industries Research Institute, National Research Centre (NRC), 33 El Buhouth St., Dokki, Giza 12622, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,15]]},"reference":[{"key":"ref_1","unstructured":"Calaprice, A. 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