Metal–metal closed-shell interaction in M 2 X 2 (M=Ag, Cu; X=Cl, Br, I) and related compounds [Ag 2 Br 2 ](PH 3 ) 3 and [Cu 2 Cl 2 ](PH 3 ) 2 : an RHF, MP2 and DFT study | Publicación