Structural and magnetic characterization of electron-transfer salts of hexacyanotrimethylenecyclopropanide, {C3[C(CN)2]3}.bul.- and [Fe(C5Me5)2].bul.+ (1:1; two phases) and [Fe(C6H3Me3)2]2+ (1:2). Evidence for 1-D antiferromagnetic behavior in segregated {Fe(C5Me5)2].bul.+ chains