Dimethylammonium dichlorotri(mu-chloro)bis[(R)-(+)-2,2'-bis(diphenylphosphino)-5,5',6,6',7,7',8,8'-octahydro-1,1'-binaphthyl]diruthenate(II) [NH2Me2][{RuCl((R)-H8-binap)}2(mu-Cl)3]