Short-RInChIKey=SA-FUHFF-UHFFFADPSC-FNFSJYCLRP-UHFFFADPSC-NUHFF-NUHFF-NUHFF-ZZZ

To a solution of TMG2Mequ (25.6 mg, 0.1 mmol, 2 eq.) in MeCN (1 ml) a solution of Cu(MeCN)42 (20.1 mg, 0.05 mmol, 1 eq.) in MeCN (1 mL) was added. The resulting solution became instantly dark green. Then DCM (1 mL) was added. By slow diffusion of pentane (approx. 3 mL) the complex Cu(TMG2Mequ)22 crystallized within a few days as dark green crystals. The yield was not determined because the crystals had to be stored in the mother liquor to protect them to perform the single-crystal X-ray diffraction measurement.