Molecular electronic spin qubits from a spin-frustrated trinuclear copper complex

The trinuclear copper( ii ) complex [Cu 3 (saltag)(py) 6 ]ClO 4 (H 5 saltag = tris(2-hydroxybenzylidene)triaminoguanidine) was synthesized and characterized by experimental as well as theoretical methods. This complex exhibits a strong antiferromagnetic coupling ( J = −298 cm −1 ) between the copper( ii ) ions, mediated by the N-N diazine bridges of the tritopic ligand, leading to a spin-frustrated system. This compound shows a T 2 coherence time of 340 ns in frozen pyridine solution, which extends to 591 ns by changing the solvent to pyridine-d 5 . Hence, the presented compound is a promising candidate as a building block for molecular spintronics. The trinuclear copper( ii ) complex [Cu 3 (saltag)(py) 6 ]ClO 4 (H 5 saltag = tris(2-hydroxybenzylidene)triaminoguanidine) was synthesized and characterized by experimental as well as theoretical methods.