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Complex (\n                    <jats:bold>1<\/jats:bold>\n                    ) crystallizes in the noncentrosymmetric (NCS) space group P2\n                    <jats:sub>1<\/jats:sub>\n                    and features a distorted octahedral Co(II) coordination environment that extends into a 3D framework. Remarkably, complex (\n                    <jats:bold>1<\/jats:bold>\n                    ) exhibits a strong second\u2010harmonic generation (SHG) response, approximately 7.4 times greater than that of KH\n                    <jats:sub>2<\/jats:sub>\n                    PO\n                    <jats:sub>4<\/jats:sub>\n                    (KDP). The pronounced activity arises from robust hydrogen\u2010bonding interactions that suppress antiparallel packing, as well as from the highly distorted, polarizable Co(II) coordination geometry. In addition, complex (\n                    <jats:bold>1<\/jats:bold>\n                    ) exhibits an optical bandgap (3.41\u00a0eV), indicating UV transparency. These findings make a complex (\n                    <jats:bold>1<\/jats:bold>\n                    ) Co(II)\u2010based framework that can be used in UV NLO applications and emphasize it as an effective synthetic approach to the design of polar metal\u2010organic systems with improved optical properties.\n                  <\/jats:p>","DOI":"10.1002\/chem.202503620","type":"journal-article","created":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T05:02:39Z","timestamp":1770699759000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["1D Cobalt\u2010Cytidine Monophosphate Coordination Polymer Exhibiting Efficient Ultraviolet Second\u2010Harmonic Generation"],"prefix":"10.1002","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2337-6065","authenticated-orcid":false,"given":"Mubashar","family":"Ilyas","sequence":"first","affiliation":[{"name":"Key Laboratory of Clusters Science of Ministry of Education, School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing P. 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