A novel blue luminescent material Na2[Co(C2O4)2(H2O)2]·6H2O: synthesis, structure, luminescence and magnetic properties.
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 P1[combining macron]. 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.
Department of Physics, Kakatiya University, Warangal 506009, India. althaf.ku2@gmail.com.
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Saritha
School of Physics, University of Hyderabad, Hyderabad 500046, India. raju.nano@gmail.com.
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Raju
Department of Physics, Kakatiya University, Warangal 506009, India. althaf.ku2@gmail.com.
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Narsimhulu
School of Physics, University of Hyderabad, Hyderabad 500046, India. raju.nano@gmail.com.
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Rao
Department of Chemistry, Dr. Harisingh Gour University, Saugor [M.P] 470003, India.
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Raghavaiah
Department of Physics, Kakatiya University, Warangal 506009, India. althaf.ku2@gmail.com.
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Hussain