Gravar-mail: [N,N′-Bis(2,6-diisopropyl­phen­yl)pentane-2,4-diamine­(1–)-2κ(2) N,N′]-μ(2)-chlorido-1:2κ(2) Cl:Cl-chlorido-2κCl-bis­(1,2-di­methoxy­ethane-1κ(2) O,O′)iron(II)lithium