Hydrothermal synthesis, crystal structure, and luminescent property of a cobalt(II) complex based on carbazole derivative

Abstract

A new cobalt(II) mononuclear complex, formulated as [Co(HL) 2 (H 2 O) 2 ] (I), has been success fully synthesized by self assembly of cobalt nitrate with 9 ethylcarbazole 3,6 dicarboxylic acid (H 2 L) under hydrothermal condition. The structure of complex I was determined by single crystal X ray diffraction anal ysis (CIF file CCDC no. 648810). The result shows that the central cobalt ion is six coordinated and the crys tal extends into a 2D supramolecular framework by hydrogen bonding and p⋅⋅⋅p stacking interactions. The luminescent properties were investigated.

A novel blue luminescent material Na2[Co(C2O4)2(H2O)2]·6H2O: synthesis, structure, luminescence and magnetic properties

“…[12][13][14][15][16] The enhancement of luminescence in the Na 2 [Co(C 2 O 4 ) 2 (H 2 O) 2 ]•6H 2 O complex may be attributed to the ligand-to-metal charge transfer. 34,35 The octahedral environment of the central Co(II) ion with oxygen ligands is also responsible for the enhancement of luminescence in the Na /3k B is obtained as 4.403µ B , which is higher than the spinonly value of 3.87µ B for a spin of S = 3/2(Co 2+ ). This is due to the occurrence in Na 2 [Co(C 2 O 4 ) 2 (H 2 O) 2 ]•6H 2 O of an unquenched orbital contribution of the 4 T 1g ground state in octahedral cobalt (II) compounds.…”