“…Usually, the copper(I) halides form di- or tetranuclear clusters with the μ 2 -, μ 3 - or μ 4 - bridging coordination of halogen ions [ 9 , 10 ]. The tetranuclear copper(I) complexes are presented by clusters with three types of copper-halide cores ( Figure 1 ): cubane-type [ 8 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ], octahedral [ 17 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], and stairstep [ 32 , 33 , 34 , 35 , 36 , 37 , 38 ].…”