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MOF\n 1<\/jats:bold>\n crystallizes in the orthorhombic system (\n Pccn<\/jats:italic>\n ,\n Z<\/jats:italic>\n \u00a0= 8) and adopts a non-interpenetrating 3D architecture with a calculated solvent-accessible void volume of 40.4%. The [Cd(adc)]\n \n n<\/jats:italic>\n <\/jats:sub>\n sublayers in\n 1<\/jats:bold>\n exhibit twofold interpenetration, resulting in closely packed layers that prevent further 3D interpenetration upon bridging by flexible bpp ligands. In contrast, MOF\n 2<\/jats:bold>\n crystallizes in the space group\n P<\/jats:italic>\n 2\n 1<\/jats:sub>\n \/\n c<\/jats:italic>\n (\n Z<\/jats:italic>\n \u00a0= 4) and adopts a twofold interpenetrated 3D framework with a reduced solvent-accessible void volume of 4.4%. This architecture originates from non-interpenetrated yet loosely packed [Co(adc)]\n \n n<\/jats:italic>\n <\/jats:sub>\n layers. Photoluminescence studies corroborate this structural dichotomy. Dense intralayer packing in\n 1<\/jats:bold>\n induces concentration quenching, whereas rigid non-interpenetrated layers in\n 2<\/jats:bold>\n preserve linker-based emission. This comparative crystallographic study demonstrates that the packing density of 2D layers dictates the propensity for higher-order catenation, highlighting interpenetration as a geometric constraint rather than a synthetic flaw.\n <\/jats:p>","DOI":"10.1107\/s2053229626010338","type":"journal-article","created":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T07:44:17Z","timestamp":1791877457000},"page":"740-749","update-policy":"https:\/\/doi.org\/10.1107\/cm_01","source":"Crossref","is-referenced-by-count":0,"title":["Contrasting interpenetration in two isoreticular MOFs with bridged layers: role of 2D layer packing density in 3D 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