Synthesis, characterization and H-2 adsorption performances of polymeric Co(II) and Ni(II) complexes of pyrazine-2,3-dicarboxylic acid and 1-vinylimidazole


Andac O., Gördük S., Yilmaz H.

JOURNAL OF THE IRANIAN CHEMICAL SOCIETY, vol.15, pp.1699-1708, 2018 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 15
  • Publication Date: 2018
  • Doi Number: 10.1007/s13738-018-1367-2
  • Journal Name: JOURNAL OF THE IRANIAN CHEMICAL SOCIETY
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1699-1708
  • Keywords: Pyrazine-2,3-dicarboxylic acid, 1-Vinylimidazole, Polymeric complex, Bridging ligand, H-2 adsorption, METAL-ORGANIC FRAMEWORKS, N-DONOR LIGANDS, HYDROGEN GAS-ADSORPTION, COORDINATION POLYMERS, MOLECULAR SIMULATIONS, MAGNETIC-PROPERTIES, STRUCTURAL-CHARACTERIZATION, CRYSTAL-STRUCTURES, CU(II) COMPLEXES, SQUARIC ACID

Abstract

We studied the synthesis and characterization of polymeric coordination complexes of Co(II) and Ni(II) ions with pyrazine-2,3-dicarboxylic acid and 1-vinylimidazole. The e lemental analysis, infrared spectroscopy, powder X-ray diffraction, magnetic susceptibility, thermal analysis and X-ray single crystal techniques were used in the characterization. The X-ray single crystal analysis suggests that the pyrazine-2,3-dicarboxylato ligand acts as a bridging ligand through the oxygen atoms of the carboxylate groups and the nitrogen atoms on the pyrazine ring. The 1-vinylimidazole ligand behaves as a monodentate ligand via the ring nitrogen atom. Further, the H-2 adsorption studies were carried out at 75 K for various increasing pressures and the highest H-2 adsorption performances for Co(II) and Ni(II) complexes were estimated as 2.66 and 2.99 wt% at 87 bar. The theoretical calculations using the crystal data were also performed to determine the voids in the structure of Co(II) complex.