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        Isoreticular Expansion of Metal–Organic Frameworks with Triangular and Square Building Units and the Lowest Calculated Density for Porous Crystals

        Furukawa, Hiroyasu,Go, Yong Bok,Ko, Nakeun,Park, Young Kwan,Uribe-Romo, Fernando J.,Kim, Jaheon,O’Keeffe, Michael,Yaghi, Omar M. American Chemical Society 2011 Inorganic Chemistry Vol.50 No.18

        <P>The concept and occurrence of isoreticular (same topology) series of metal–organic frameworks (MOFs) is reviewed. We describe the preparation, characterization, and crystal structures of three new MOFs that are isoreticular expansions of known materials with the <B>tbo</B> (Cu<SUB>3</SUB>(4,4′,4″-(benzene-1,3,5-triyl-tris(benzene-4,1-diyl))tribenzoate)<SUB>2</SUB>, MOF-399) and <B>pto</B> topologies (Cu<SUB>3</SUB>(4,4′,4″-(benzene-1,3,5-triyl-tribenzoate)<SUB>2</SUB>, MOF-143; Cu<SUB>3</SUB>(4,4′,4″-(triazine-2,4,6-triyl-tris(benzene-4,1-diyl))tribenzoate)<SUB>2</SUB>, MOF-388). One of these materials (MOF-399) has a unit cell volume 17 times larger than that of the first reported material isoreticular to it, and has the highest porosity (94%) and lowest density (0.126 g cm<SUP>–3</SUP>) of any MOFs reported to date.</P><P>Syntheses of three new metal−organic frameworks (MOFs) that are isoreticular (same topology) expansions of known materials with the <B>tbo</B> and <B>pto</B> topologies are reported. One of these materials (MOF-399) has a unit cell volume 17 times larger than that of the first reported material isoreticular to it, and has the highest void fraction (94%) and lowest density (0.126 g cm<SUP>−3</SUP>) of any MOFs reported to date.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2011/inocaj.2011.50.issue-18/ic201376t/production/images/medium/ic-2011-01376t_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic201376t'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic201376t'>ACS Electronic Supporting Info</A></P>

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