Synthesis, Crystal Structure, and Catalytic Properties of Porous 3d‐4f Heterometallic Coordination Polymers Constructed from Pyrazine‐2, 3‐dicarboxylic Acid. Issue 22 (7th November 2017)

• Record Type: Journal Article
• Authors: Yang, Ting‐Hai; Silva, Ana Rosa; Fu, Lianshe; Shi, Fa‐Nian
• Is Part Of: Zeitschrift für anorganische und allgemeine Chemie. Volume 643:Issue 22(2017)
• Page Start: 1801
• Page End: 1808
• Publication Date: 2017-11-07
• Subjects: Pyrazine‐2, 3‐dicarboxylic acid -- Heterometal coordination polymers -- Cobalt -- Lanthanides -- Catalytic properties; Chemistry, Inorganic -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1002/zaac.201700344
• Languages: English
• ISSNs: 0044-2313

Abstract

Abstract : Reactions of pyrazine‐2, 3‐dicarboxylic acid (H2 pzdc), cobalt nitrate and lanthanide ( Ln ) oxide under hydrothermal conditions result in four new 3d‐4f heterometal coordination polymers, namely, [ Ln 2 Co(pzdc)4 (H2 O)6 ]· 2H2 O [ Ln = La (1 ), Pr (2 ), Eu (3 ) and Gd (4 )]. All compounds were characterized by elemental analysis, infrared spectroscopy, thermal gravimetric analysis, and X‐ray diffraction. The compounds exhibit a three‐dimensional (3D) brick‐like structure with rectangular‐shaped nano‐scale channels along a axis direction, made up of wave‐like layers containing [ Ln (pzdc)] + units, which are connected by one‐dimensional (1D) chain of [Co(pzdc)2 ] 2– . The catalytic properties of compounds1 and3 were investigated in the synthesis of cyanohydrins at room temperature under solventless conditions. They showed similar catalytic activities with very high conversions of benzaldehyde and high selectivity towards cyanohydrin. The control experiment without addition of the coordination polymers only reached 16 % conversion. Other aldehydes could also be converted totally under shorter reaction times also with very high selectivities for the corresponding cyanohydrins. Compound1 could also be recycled in another catalytic cycle. Abstract :