Gravar-mail: Bis[N,N′-bis­(2,6-diisopropyl­phen­yl)ethane-1,2-diimine]-1κ(2) N,N′;2κ(2) N,N′-tri-μ-trichlorido-1:2κ(6) Cl:Cl-chlorido-1κCl-tetra­hydro­furan-2κO-dichromium(II) dichloro­methane 4.5-solvate