From monomeric to polymeric manganese complexes bearing bis(imino)pyridine and related ligands
Abstract
Reactions of MnX2 with the tridentate CMe}2C5H3N], [2,6-{(Me)(Ph)NN
CMe}2C5H3N] and [2-{(2,6-Pri2C6H3)N
CH}-6-{(2,6-Pri2C6H3)NHCH(Me)}C5H3N] in refluxing
CMe}2C5H3N]MnX2
(X = Br 1), [2,6-{(Me)(Ph)NN
CMe}2C5H3N]MnX2
(X = Cl 2) and [2-{(2,6-Pri2C6H3)N
CH}-6-{(2,6-Pri2C6H3)NHCH(Me)}C5H3N]MnX2
(X = Cl 3), respectively, in good yield. Crystallographic studies on 1–3 reveal all three complexes to be pentacoordinate with geometries that can be best described as distorted trigonal bipyramidal (1, 2) or square pyramidal (3). Conversely, treatment of MnCl2 with [2-{(2″-H2NC6H4–C2H4–2″-C6H4)N
CMe}-6-{O
CMe}C5H3N]
(prepared from the incomplete condensation reaction of the
CMe)2}2(C5H3N)2}Mn2Cl3(NCMe)2][{2,6-{(2′,2″-C6H4–CH2)2(N
CMe)2}2(C5H3N)2}Mn2Cl3(MnCl4)]n
(4). The molecular structure of 4 shows a discrete dimanganese