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

Research paper by A. Saritha, B. Raju, M. Narsimhulu, D. Narayana Rao, P. Raghavaiah, K. A. Hussain

Indexed on: 27 Apr '16Published on: 12 Apr '16Published in: Dalton Transactions



Abstract

The synthesis, crystal structure and physical properties of new disodium trans-diaquabis(oxalato)cobaltate(II)hexahydrate {Na2[Co(C2O4)2(H2O)2]·6H2O} crystals have been investigated. Single crystal X-ray analysis reveals that this compound crystallizes in the triclinic system with the space group P. The structure of this complex consists of [Co(C2O4)2(H2O)2]2− anionic units with a slightly distorted octahedral geometry of cobalt surrounded by four oxygen atoms of two oxalate groups. The anionic units are interlinked by two Na+ ions with different octahedral and distorted octahedral environments. The electronic absorption spectra of the compound exhibit bands at 208, 246 and 526 nm in the UV and visible regions. A strong blue luminescence was observed at room temperature when excited at 355 nm. The M(H) curve at 2 K shows a significant nonlinear behaviour with almost zero coercivity which clearly indicates an extremely weak antiferromagnetic/ferromagnetic state of the complex.

Graphical abstract 10.1039/C6DT01185C.gif