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Abstract
Peter Day’s research group reported the first molecular superconductor containing paramagnetic metal ions in 1995, β″-(BEDT-TTF)4(H3O)Fe(C2O4)3·C6H5CN. Subsequent research has produced a multitude of BEDT-TTF-tris(oxalato)metallate salts with a variety of structures and properties, including 32 superconductors to date. We present here the synthesis, crystal structure, and conducting properties of the newest additions to the Day series including the first superconductor incorporating the diamagnetic tris(oxalato)aluminate anion, β″-(BEDT-TTF)4(H3O)Al(C2O4)3·C6H5Br, which has a superconducting Tc of ~2.5 K. β″-(BEDT-TTF)4(H3O)Co(C2O4)3·C6H5Br represents the first example of a β″ phase for the tris(oxalato)cobaltate anion, but this salt does not show superconductivity.
Highlights
The first paramagnetic superconductor, β”-(BEDT-TTF)4 (H3 O)Fe(C2 O4 )3 ·C6 H5 CN, was discovered in 1995 by the group of Professor Peter Day at the Royal Institution of GreatBritain [1]
We reported the synthesis and characterization of β”-(BEDT-TTF)4 (H3 O)
Al(C2 O4 )3 ·C6 H5 Br (Al-PhBr), which represents the first superconductor in the Day series to contain the tris(oxalato)aluminate anion
Summary
The first paramagnetic superconductor, β”-(BEDT-TTF) (H3 O)Fe(C2 O4 )3 ·C6 H5 CN, was discovered in 1995 by the group of Professor Peter Day at the Royal Institution of GreatBritain [1]. The ability of tris(oxalato)metallate(III) anions, M(C2 O4 )3 3− , to bridge through oxalate ions with monocations or metal(II) ions and form 2D sheets opened the door to a huge variety of structures and properties in radical cation salts with BEDT-TTF [2]. This family of salts includes paramagnetic superconductors, and a ferromagnetic metal [3], antiferromagnetic semiconductor [4], and proton conductor [5,6]. The anion layers are built up of M and A bridged by oxalate ligands to form a honeycomb with guest molecules, G, contained within the hexagons
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