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This review summarizes the emergence and recent advances in the development of MOF\u2010in\u2010COF materials, focusing on topics such as the synthesis strategies aimed at achieving specific pore structures and functionalities, particularly in gas separation and ion conduction applications. The tailored pore structure of MOF\u2010in\u2010COF materials imparts two distinctive features: a pore size smaller than that of the basal COF and a modulated internal surface environment within the pores. These unique characteristics enable the synergy of precise molecular sieving and efficient ion transport. Consequently, MOF\u2010in\u2010COFs have been explored as selective gas separation membranes and ion\u2010sieving materials. This perspective article provides an outlook on the future development and potential applications of MOF\u2010in\u2010COF structures, based on their reported properties and current applications.<\/jats:p>","DOI":"10.1002\/asia.70991","type":"journal-article","created":{"date-parts":[[2026,9,17]],"date-time":"2026-09-17T14:57:45Z","timestamp":1789657065000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Metal\u2013Organic Frameworks Confined Within Covalent\u2010Organic Frameworks: Advances &amp; Perspectives"],"prefix":"10.1002","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-6545-3066","authenticated-orcid":false,"given":"Zhiyi","family":"Yu","sequence":"first","affiliation":[{"name":"Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material Engineering Jiangnan University  Wuxi P. R. 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