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Reversible Interpenetration in a Metal–Organic Framework Triggered by Ligand Removal and Addition
Choi, Sang Beom,Furukawa, Hiroyasu,Nam, Hye Jin,Jung, Duk‐,Young,Jhon, Young Ho,Walton, Allan,Book, David,O'Keeffe, Michael,Yaghi, Omar M.,Kim, Jaheon WILEY‐VCH Verlag 2012 Angewandte Chemie Vol.124 No.35
<P><B>Reversibles Ineinander</B>: Kristalle des Metall‐organischen Gerüsts MOF‐123 [Zn<SUB>7</SUB>O<SUB>2</SUB>(NBD)<SUB>5</SUB>(DMF)<SUB>2</SUB>] haben eine dreidimensionale poröse Struktur, in der DMF‐Liganden (rosa im Bild) in kleine Kanäle hineinragen. Entfernt man diese Liganden, so resultiert das doppelt verzahnte Gerüst MOF‐246 [Zn<SUB>7</SUB>O<SUB>2</SUB>(NBD)<SUB>5</SUB>], das auf DMF‐Zugabe hin wieder in MOF‐123 übergeht. NBD=2‐Nitrobenzol‐1,4‐dicarboxylat.</P>
Park, Sarah S.,Hendon, Christopher H.,Fielding, Alistair J.,Walsh, Aron,O’Keeffe, Michael,Dincă,, Mircea American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.10
<P>The structure-directing role of the inorganic secondary building unit (SBU) is key for determining the topology of metal organic frameworks (MOFs). Here we show that organic building units relying on strong Ir interactions that are energetically competitive with the formation of common inorganic SBUs can also play a role in defining the topology. We demonstrate the importance of the organic SBU in the formation of Mg2H6(H3O)(TTFTB)(3) (MIT-25), a mesoporous MOF with the new ssp topology. A delocalized electronic hole is critical in the stabilization of the TTF triad organic SBUs and exemplifies a design principle for future MOF synthesis.</P>
Circulatory Antigen Processing by Mucosal Dendritic Cells Controls CD8<sup>+</sup> T Cell Activation
Chang, S.Y.,Song, J.H.,Guleng, B.,Cotoner, C.,Arihiro, S.,Zhao, Y.,Chiang, H.S.,O'Keeffe, M.,Liao, G.,Karp, Christopher L.,Kweon, M.N.,Sharpe, Arlene H.,Bhan, A.,Terhorst, C.,Reinecker, H.C. Cell Press 2013 Immunity Vol.38 No.1
Circulatory antigens transit through the small intestine via the fenestrated capillaries in the lamina propria prior to entering into the draining lymphatics. But whether or how this process controls mucosal immune responses remains unknown. Here we demonstrate that dendritic cells (DCs) of the lamina propria can sample and process both circulatory and luminal antigens. Surprisingly, antigen cross-presentation by resident CX3CR1<SUP>+</SUP> DCs induced differentiation of precursor cells into CD8<SUP>+</SUP> T cells that expressed interleukin-10 (IL-10), IL-13, and IL-9 and could migrate into adjacent compartments. We conclude that lamina propria CX3CR1<SUP>+</SUP> DCs facilitate the surveillance of circulatory antigens and act as a conduit for the processing of self- and intestinally absorbed antigens, leading to the induction of CD8<SUP>+</SUP> T cells, that partake in the control of T cell activation during mucosal immune responses.
Naik, Shalin H,Sathe, Priyanka,Park, Hae-Young,Metcalf, Donald,Proietto, Anna I,Dakic, Aleksander,Carotta, Sebastian,O'Keeffe, Meredith,Bahlo, Melanie,Papenfuss, Anthony,Kwak, Jong-Young,Wu, Li,Shortm NATURE AMERICA INC 2007 NATURE IMMUNOLOGY Vol.8 No.11
The development of functionally specialized subtypes of dendritic cells (DCs) can be modeled through the culture of bone marrow with the ligand for the cytokine receptor Flt3. Such cultures produce DCs resembling spleen plasmacytoid DCs (pDCs), CD8<SUP>+</SUP> conventional DCs (cDCs) and CD8<SUP>−</SUP> cDCs. Here we isolated two sequential DC-committed precursor cells from such cultures: dividing 'pro-DCs', which gave rise to transitional 'pre-DCs' en route to differentiating into the three distinct DC subtypes (pDCs, CD8<SUP>+</SUP> cDCs and CD8<SUP>−</SUP> cDCs). We also isolated an in vivo equivalent of the DC-committed pro-DC precursor cell, which also gave rise to the three DC subtypes. Clonal analysis of the progeny of individual pro-DC precursors demonstrated that some pro-DC precursors gave rise to all three DC subtypes, some produced cDCs but not pDCs, and some were fully committed to a single DC subtype. Thus, commitment to particular DC subtypes begins mainly at this pro-DC stage.
Terminology of metal-organic frameworks and coordination polymers (IUPAC Recommendations 2013)
Batten, Stuart R.,Champness, Neil R.,Chen, Xiao-Ming,Garcia-Martinez, Javier,Kitagawa, Susumu,Ö,hrströ,m, Lars,O’Keeffe, Michael,Paik Suh, Myunghyun,Reedijk, Jan De Gruyter 2013 Pure and applied chemistry. Vol.85 No.8
<P>A set of terms, definitions, and recommendations is provided for use in the classification of coordination polymers, networks, and metal–organic frameworks (MOFs). A hierarchical terminology is recommended in which the most general term is coordination polymer. Coordination networks are a subset of coordination polymers and MOFs a further subset of coordination networks. One of the criteria an MOF needs to fulfill is that it contains potential voids, but no physical measurements of porosity or other properties are demanded per se. The use of topology and topology descriptors to enhance the description of crystal structures of MOFs and 3D-coordination polymers is furthermore strongly recommended.</P>
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>
Large-Pore Apertures in a Series of Metal-Organic Frameworks
Deng, H.,Grunder, S.,Cordova, K. E.,Valente, C.,Furukawa, H.,Hmadeh, M.,Gandara, F.,Whalley, A. C.,Liu, Z.,Asahina, S.,Kazumori, H.,O'Keeffe, M.,Terasaki, O.,Stoddart, J. F.,Yaghi, O. M. American Association for the Advancement of Scienc 2012 Science Vol.336 No.6084
<P>We report a strategy to expand the pore aperture of metal-organic frameworks (MOFs) into a previously unattained size regime (>32 angstroms). Specifically, the systematic expansion of a well-known MOF structure, MOF-74, from its original link of one phenylene ring (I) to two, three, four, five, six, seven, nine, and eleven (II to XI, respectively), afforded an isoreticular series of MOF-74 structures (termed IRMOF-74-I to XI) with pore apertures ranging from 14 to 98 angstroms. All members of this series have noninterpenetrating structures and exhibit robust architectures, as evidenced by their permanent porosity and high thermal stability (up to 300C). The pore apertures of an oligoethylene glycol-functionalized IRMOF-74-VII and IRMOF-74-IX are large enough for natural proteins to enter the pores.</P>