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This ligand was used to react with Zn\n                    <jats:sup>2+<\/jats:sup>\n                    and Cd\n                    <jats:sup>2+<\/jats:sup>\n                    ions under hydrothermal conditions in the presence of N-containing heterocyclic auxiliary ligands [1,4-bis(2-methyl-1\n                    <jats:italic>H<\/jats:italic>\n                    -imidazol-1-yl)benzene (1,4-bmib) and 1,1\u2032-(2,5-dimethyl-1,4-phenylene)bis(1\n                    <jats:italic>H<\/jats:italic>\n                    -imidazole) (2,5-dpb)], successfully constructing two chiral coordination polymers (CPs), namely, poly[[\u03bc-1,4-bis(2-methyl-1\n                    <jats:italic>H<\/jats:italic>\n                    -imidazol-1-yl)benzene-\u03ba\n                    <jats:sup>2<\/jats:sup>\n                    <jats:italic>N<\/jats:italic>\n                    :\n                    <jats:italic>N<\/jats:italic>\n                    \u2032][\u03bc-(\n                    <jats:italic>R<\/jats:italic>\n                    )-3-(1-carboxylatoethoxy)benzoato-\u03ba\n                    <jats:sup>2<\/jats:sup>\n                    <jats:italic>O<\/jats:italic>\n                    :\n                    <jats:italic>O<\/jats:italic>\n                    \u2032]zinc(II)], [Zn(C\n                    <jats:sub>10<\/jats:sub>\n                    H\n                    <jats:sub>8<\/jats:sub>\n                    O\n                    <jats:sub>5<\/jats:sub>\n                    )(C\n                    <jats:sub>14<\/jats:sub>\n                    H\n                    <jats:sub>14<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    )]\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    or HCU40-\n                    <jats:italic>R<\/jats:italic>\n                    , and poly[[\u03bc-1,4-bis(1\n                    <jats:italic>H<\/jats:italic>\n                    -imidazol-1-yl)-2,5-dimethylbenzene-\u03ba\n                    <jats:sup>2<\/jats:sup>\n                    <jats:italic>N<\/jats:italic>\n                    :\n                    <jats:italic>N<\/jats:italic>\n                    \u2032][\u03bc-(\n                    <jats:italic>R<\/jats:italic>\n                    )-3-(1-carboxylatoethoxy)benzoato-\u03ba\n                    <jats:sup>4<\/jats:sup>\n                    <jats:italic>O<\/jats:italic>\n                    ,\n                    <jats:italic>O<\/jats:italic>\n                    \u2032:\n                    <jats:italic>O<\/jats:italic>\n                    \u2032\u2032,\n                    <jats:italic>O<\/jats:italic>\n                    \u2032\u2032\u2032]cadmium(II)], [Cd(C\n                    <jats:sub>10<\/jats:sub>\n                    H\n                    <jats:sub>8<\/jats:sub>\n                    O\n                    <jats:sub>5<\/jats:sub>\n                    )(C\n                    <jats:sub>14<\/jats:sub>\n                    H\n                    <jats:sub>14<\/jats:sub>\n                    N\n                    <jats:sub>4<\/jats:sub>\n                    )]\n                    <jats:sub>\n                      <jats:italic>n<\/jats:italic>\n                    <\/jats:sub>\n                    or HCU41-\n                    <jats:italic>R<\/jats:italic>\n                    . Both CPs crystallize in the chiral space group\n                    <jats:italic>P<\/jats:italic>\n                    2\n                    <jats:sub>1<\/jats:sub>\n                    , and the central chirality from the (\n                    <jats:italic>R<\/jats:italic>\n                    )-cea\n                    <jats:sup>2\u2212<\/jats:sup>\n                    anion is transferred and amplified into supramolecular helical chirality. In HCU40-\n                    <jats:italic>R<\/jats:italic>\n                    , the Zn\n                    <jats:sup>2+<\/jats:sup>\n                    ions adopt a tetrahedral geometry, forming a one-dimensional right-handed helical chain that further extends into a two-dimensional helical layer. In HCU41-\n                    <jats:italic>R<\/jats:italic>\n                    , the Cd\n                    <jats:sup>2+<\/jats:sup>\n                    ions exhibit an octahedral geometry, displaying a double-helical chain and a twofold interpenetrated two-dimensional layered structure. Powder X-ray diffraction and elemental analysis confirmed the phase purity of the samples. Thermogravimetric analysis revealed thermal stability up to 350\u2005\u00b0C for HCU40-\n                    <jats:italic>R<\/jats:italic>\n                    and 300\u2005\u00b0C for HCU41-\n                    <jats:italic>R<\/jats:italic>\n                    . Fluorescence measurements showed emission peaks at 451\u2005nm for HCU40-\n                    <jats:italic>R<\/jats:italic>\n                    and 491\u2005nm for HCU41-\n                    <jats:italic>R<\/jats:italic>\n                    . Furthermore, both compounds exhibited second-order nonlinear optical (NLO) effects, with second harmonic generation (SHG) intensities of 0.38 and 0.35 times that of KDP, respectively.\n                  <\/jats:p>","DOI":"10.1107\/s2053229626005784","type":"journal-article","created":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T14:47:36Z","timestamp":1780498056000},"page":"358-367","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":3,"title":["From central chirality to helical chirality: two chiral coordination polymers based on a lactic acid derivative and their SHG responses"],"prefix":"10.1107","volume":"82","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-3540-1018","authenticated-orcid":true,"given":"Qian-Qian","family":"Chen","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05pjkyk24","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-0001-8863","authenticated-orcid":true,"given":"Hong-Yuan","family":"Qin","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05pjkyk24","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-5985-3211","authenticated-orcid":true,"given":"Juan","family":"Yan","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05pjkyk24","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0004-5274-2126","authenticated-orcid":true,"given":"Xue-Ling","family":"Liang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05pjkyk24","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chun-Gang","family":"Chen","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05pjkyk24","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2276-7184","authenticated-orcid":true,"given":"Zhong-Xuan","family":"Xu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05pjkyk24","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiu-Ju","family":"Yin","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05pjkyk24","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"329","published-online":{"date-parts":[[2026,6,16]]},"reference":[{"key":"jx3106_bb1","doi-asserted-by":"crossref","first-page":"143083","DOI":"10.1016\/j.chemosphere.2024.143083","volume":"364","author":"Abbas","year":"2024","journal-title":"Chemosphere"},{"key":"jx3106_bb2","doi-asserted-by":"crossref","first-page":"3085","DOI":"10.1039\/C5SC03839A","volume":"7","author":"Chandrasekhar","year":"2016","journal-title":"Chem. 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