A new room-temperature ultraviolet emission material: K2[Ni(C2O4)2(H2O)2]·4H2O

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

“…17 In this context, the oxalate ligand is a better choice to build a bifunctional material combining magnetism and luminescence because of its orbital topology, negative charge and good donor ability due to the presence of four oxygen atoms. [18][19][20] In continuation of our earlier work on metal oxalates, 21 recently we have reported room-temperature ultraviolet luminescence from a potassium nickel oxalate complex 22 and these results have motivated us to work further on new metal oxalate complexes. Herein, we report the synthesis, crystal structure and physical properties of a new disodium trans-dia-…”

Optical Phenomena in Molecule-Based Magnetic Materials

“…By combining its emitting properties with the ferromagnetic ( T c = 19 K) properties of the open bimetallic framework with shape-selective sorption behavior, this material allows the identification of small molecules and observation of the host-guest interactions. The second approach concerns the use of a diamagnetic luminescent species in the construction of a magnetic system. − It was shown in a small group of coordination polymers, built of carboxylate-bridged Co­(II)- or Ni­(II)-based networks showing magnetic coupling and the emission property originating from a bridging organic ligand. A special family of materials in this group are metal oxalato complexes with alkali cations, {A I 2 [M II (C 2 O 4 ) 2 (H 2 O) 2 ]}·solvent (A = Na, K; M = Co, Ni), based on oxalato-bridged anionic chains (Figure ).…”

Synthesis, Structure, and Electrochemical Properties of Some Cobalt Oxalates

“…As one of the simplest motifs, the oxalate group (C 2 O 4 ) 2– has exhibited versatile coordination modes to adjacent cations such as monodentate or bidentate, forming various structures with zero-, one-, two-, or three-dimensional frameworks. − In synthetic chemistry, oxalic acid has multiple functions, e.g., as a pH adjustor, reductive medium, mild temperature solvent, as well as template. − Work by the groups of Rao , and Cheetham − has greatly enriched the range of known structure types and synthesis methods of oxalates. Among them, transition-metal oxalates have attracted particular research interest due to their potential applications in magnetics, energy storage, photoemission, etc. − In these compounds, transition metals provide the intrinsic functional center while oxalate groups act to mediate certain properties such as magnetic exchange, electronic mobility, or electrochemical charge transfer. The exploration of transition-metal oxalates has thus led to many functional materials.…”