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Published on: March 19, 2020
Structural and reactivity investigations using organo-copper(i) and zinc(ii) complexes with hydrogen and carbon
Bradley E Cowie1, Andreas Phanopoulos1,2, Milo S P Shaffer3,4
1Department of Chemistry, University of Oxford, Chemistry Research Laboratory 12 Mansfield Road Oxford OX1 3TA UK charlotte.williams@chem.ox.ac.uk.
Abstract:
Heterogeneous copper zinc catalysts are widely used in syn-gas or carbon dioxide hydrogenation to methanol, but the structures and reactivity at the catalytic active sites are still not fully understood. Well-defined metal complexes and clusters may help reveal the structures of key intermediates, including for catalytic reactions involving gaseous species. Here, a tri-copper(i) complex, [Cu3{µ:κ3(PPC)-dppm'}2{µ:κ2(PP)-dppm'}] 1 (dppm' = [(Ph2P)2CH]-) is used as the starting point to investigate reactivity with hydrogen and carbon dioxide in solution and at low temperatures (20-60 °C) and gas pressures (1 bar or lower). Complex 1 reacts with hydrogen to afford a copper-hydride cluster, [Cu5(µ-H)(µ3-H)2(µ:κ3(PPC)-dppm')2(µ:κ2(PP)-dppm)2] 2, which contains five CuI centres and three hydrido ligands. The reaction of 2 with carbon dioxide provides a tri-copper(i)-bis(formate)(hydrido) complex, [Cu3(µ3-H)(κ1(O)-O2CH)(µ:κ2(OO)-O2CH)(µ:κ2(PP)-dppm)3] 3, in which two molecules of carbon dioxide react with the hydrides to produce formate ligands. Treating 1 with an organozinc(ii) complex, [Zn(C6F5)2], affords a hetero-tetrametallic CuI 2ZnII 2 complex, [Cu2(µ:κ3(PPC)-dppm')2{Zn(C6F5)2}2] 4. Complex 4 features two cationic Cu(i) and two anionic Zn(ii) centres, adopting an unusual copper zincate speciation, and reacts with carbon dioxide to form a bis(carboxylate)-CuI 2ZnII 2 complex, [Cu2(µ:κ4(PPOO)-dppm″)2{Zn(C6F5)2}2] 5; carbon dioxide inserts into the Zn-C bond and forms a new C-C bond with the methine carbon of the dppm' ligand. Overall, the structures and reactivity indicate that CuI sites readily form hydrides, on exposure to hydrogen; these cuprous hydrides react with CO2 to produce formate, and cuprous zincates react with CO2 to afford carboxylates.
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