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Here, we report a family of heterometallic MOF, MIP215(Zr\n                    <jats:sup>IV<\/jats:sup>\n                    \/M\n                    <jats:sup>II<\/jats:sup>\n                    ) (M\n                    <jats:sup>II<\/jats:sup>\n                    \u00a0 = \u00a0Cu, Ni), constructed from 8\u2010connected Zr\n                    <jats:sub>6<\/jats:sub>\n                    oxoclusters and 4\u2010connected pyrazolate\u2013carboxylate metalloligands using a onepot, ambient, water only synthesis. The resulting 4,8\u2010connected\n                    <jats:bold>scu<\/jats:bold>\n                    frameworks feature one\u2010dimensional microporous channels, chemical robustness in aqueous and organic media, and reversible solvent\u2010responsive flexibility upon dehydration\/rehydration. Both Cu or Ni based solids exhibit broad visible absorption range up to\n                    <jats:italic>ca<\/jats:italic>\n                    . 800\u00a0nm, and suitable band\u2010edge positions for H\n                    <jats:sub>2<\/jats:sub>\n                    evolution in water\/methanol under simulated sunlight. In the absence of any cocatalyst, MIP215(Zr\/Cu) delivers sustained activity exceeding 1\u00a0mmol\u00b7g\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    H\n                    <jats:sub>2<\/jats:sub>\n                    in 5\u00a0h, while MIP215(Zr\/Ni) displays higher initial rates but reduced stability, in line with observed metalleaching and crystallinity loss. Time\u2010dependent density functional theory calculations indicate that ligand\u2010to\u2010metal charge\u2010transfer states localized on the metalloligands govern the photocatalytic response, underscoring the role of photophysics beyond thermodynamic driving force in the superior Cu\u2010based performance. This work establishes a green and scalable approach to robust, flexible heterometallic MOFs with tunable photoactivity for efficient, noblemetalfree solar hydrogen production.\n                  <\/jats:p>","DOI":"10.1002\/smll.74136","type":"journal-article","created":{"date-parts":[[2026,6,11]],"date-time":"2026-06-11T11:51:14Z","timestamp":1781178674000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["A Versatile Heterometallic Microporous MOF for Photocatalytic Hydrogen Generation"],"prefix":"10.1002","author":[{"given":"Xingze","family":"Wang","sequence":"first","affiliation":[{"name":"Institut des Mat\u00e9riaux Poreux de Paris, Ecole Normale Sup\u00e9rieure, ESPCI Paris, CNRS PSL University  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juan Jos\u00e9","family":"Ram\u00edrez\u2010Hern\u00e1ndez","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Universitat Polit\u00e8cnica de Val\u00e8ncia  Valencia Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Iurii","family":"Dovgaliuk","sequence":"additional","affiliation":[{"name":"Institut des Mat\u00e9riaux Poreux de Paris, Ecole Normale Sup\u00e9rieure, ESPCI Paris, CNRS PSL University  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentin Diez","family":"Cabanes","sequence":"additional","affiliation":[{"name":"ICGM, Universit\u00e9 de Montpellier, CNRS ENSCM  Montpellier France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Debanjan","family":"Chakraborty","sequence":"additional","affiliation":[{"name":"Institut des Mat\u00e9riaux Poreux de Paris, Ecole Normale Sup\u00e9rieure, ESPCI Paris, CNRS PSL University  Paris France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Herme G.","family":"Baldov\u00ed","sequence":"additional","affiliation":[{"name":"Departamento de Qu\u00edmica Universitat 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