Volume 55, Issue 40 pp. 12351-12355
Communication

A PCP Pincer Ligand for Coordination Polymers with Versatile Chemical Reactivity: Selective Activation of CO2 Gas over CO Gas in the Solid State

Junpeng He

Junpeng He

Department of Chemistry, The University of Texas at Austin, NHB 6.336, 100 E. 24th St. Stop A1590, Austin, TX, 78712 USA

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Nolan W. Waggoner

Nolan W. Waggoner

Department of Chemistry, The University of Texas at Austin, NHB 6.336, 100 E. 24th St. Stop A1590, Austin, TX, 78712 USA

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Samuel G. Dunning

Samuel G. Dunning

Department of Chemistry, The University of Texas at Austin, NHB 6.336, 100 E. 24th St. Stop A1590, Austin, TX, 78712 USA

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Dr. Alexander Steiner

Dr. Alexander Steiner

Department of Chemistry, University of Liverpool, Crown St., Liverpool, L69 7ZD UK

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Dr. Vincent M. Lynch

Dr. Vincent M. Lynch

Department of Chemistry, The University of Texas at Austin, NHB 6.336, 100 E. 24th St. Stop A1590, Austin, TX, 78712 USA

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Prof. Simon M. Humphrey

Corresponding Author

Prof. Simon M. Humphrey

Department of Chemistry, The University of Texas at Austin, NHB 6.336, 100 E. 24th St. Stop A1590, Austin, TX, 78712 USA

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First published: 17 August 2016
Citations: 50

Graphical Abstract

Poly-PCP-pincers: A new synthetic strategy for the formation of crystalline, porous versions of PCP-pincer complexes is presented. These complexes can selectively activate gas molecules, such as CO2 over CO, in the solid state. PCP=Porous Coordination Polymer

Abstract

A tetra(carboxylated) PCP pincer ligand has been synthesized as a building block for porous coordination polymers (PCPs). The air- and moisture-stable PCP metalloligands are rigid tetratopic linkers that are geometrically akin to ligands used in the synthesis of robust metal–organic frameworks (MOFs). Here, the design principle is demonstrated by cyclometalation with PdIICl and subsequent use of the metalloligand to prepare a crystalline 3D MOF by direct reaction with CoII ions and structural resolution by single crystal X-ray diffraction. The Pd−Cl groups inside the pores are accessible to post-synthetic modifications that facilitate chemical reactions previously unobserved in MOFs: a Pd−CH3 activated material undergoes rapid insertion of CO2 gas to give Pd−OC(O)CH3 at 1 atm and 298 K. However, since the material is highly selective for the adsorption of CO2 over CO, a Pd−N3 modified version resists CO insertion under the same conditions.

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