A complex of Formula or Formula wherein: G is Mn, Fe, Ni, or Co; each occurrence of R 1, R 2, R 3, R 4, R 5, R 6, R 7, R 8, R 9, R 30 and R 31 is independently hydrogen, an inert functional group, C1-C18 alkyl, C1-C18 substituted alkyl, aryl, or substituted aryl, wherein optionally each of R 1 to R 9, R 30 and R 31 may independently contain at least one heteroatom; optionally any two of R 3, R 7, R 8, R 9, R 30, and R 31 vicinal to one another taken together may form a ring being a substituted or unsubstituted, saturated, or unsaturated cyclic structure; L 1 and L 2 each is a C1-C18 alkyl, C1-C18 substituted alkyl, aryl, substituted aryl, C2-C18 alkene or C2-C18 alkyne, provided that when L 1 and L 2 are alkene or alkyne, L 1 and L 2 bond with G through an unsaturated site of alkene or alkyne, or L 1 -L 2 together is one of the following: or wherein each occurrence of R 10, R 11, R 13, R 14, R 15 and R 16 is independently hydrogen, C1-C18 alkyl, C2-C18 alkenyl, or C2-C18 alkynyl, wherein R 10, R 11, R 13, R 14, R 15 and R 16, other than hydrogen, optionally contain at least one heteroatom, and R 10, R 11, R 13, R 14, R 15 and R 16, other than hydrogen, are optionally substituted; each occurrence of R 12 is independently C1-C18 alkyl, C1-C18 substituted alkyl, C2-C18 alkenyl, C2-C18 substituted alkenyl, C2-C18 alkynyl, C2-C18 substituted alkynyl, aryl, substituted aryl, wherein R 12 optionally contains at least one heteroatom; optionally any two of R 10, R 11, R 12, R 13, R 14, R 15, R 16 taken together form a ring being a substituted or unsubstituted, saturated or unsaturated cyclic structure; each occurrence of R 17 and R 18 is independently alkyl, substituted alkyl, aryl, or substituted aryl, wherein each of R 17 and R 18 optionally contains at least one heteroatom, and wherein R 17 and R 18 taken together optionally form a ring being a substituted or unsubstituted, saturated or unsaturated cyclic structure; each occurrence of R 19 and R 20 is independently a covalent bond that connects Si and C, an alkyl, substituted alkyl, or a heteroatom, wherein R 19 and R 20 optionally contain at least one heteroatom; wherein L 1 -L 2 bonds with G through unsaturated sites S 1 and S 2; and X is an anion; with the proviso that Formula does not encompass the following complexes: Iron, dichloro[N,N'-[(2,8-quinolinediyl-κN)diethylidyne]bis[2,6-dimethylbenzenamine-κN]]-, Cobalt, dichloro[N,N'-[(2,8-quinolinediyl-κN)diethylidyne]bis[2,6-dimethylbenzenamine-κN]]-, (SP-5-14)-, Iron, dichloro[N,N'-[(2,8-quinolinediyl-κN)diethylidyne]bis[2,4,6-trimethylbenzenamine-κN]]- and Cobalt, dichloro[N,N'-[(2,8-quinolinediyl-κN)diethylidyne]bis[2,4,6-trimethylbenzenamine-κN]]-. G is Mn, Fe, Ni, or Co; each occurrence of R 1, R 2, R 3, R 4, R 5, R 6, R 7, R 8, R 9, R 30 and R 31 is independently hydrogen, an inert functional group, C1-C18 alkyl, C1-C18 substituted alkyl, aryl, or substituted aryl, wherein optionally each of R 1 to R 9, R 30 and R 31 may independently contain at least one heteroatom; optionally any two of R 3, R 7, R 8, R 9, R 30, and R 31 vicinal to one another taken together may form a ring being a substituted or unsubstituted, saturated, or unsaturated cyclic structure; L 1 and L 2 each is a C1-C18 alkyl, C1-C18 substituted alkyl, aryl, substituted aryl, C2-C18 alkene or C2-C18 alkyne, provided that when L 1 and L 2 are alkene or alkyne, L 1 and L 2 bond with G through an unsaturated site of alkene or alkyne, or L 1 -L 2 together is one of the following: or wherein each occurrence of R 10, R 11, R 13, R 14, R 15 and R 16 is independently hydrogen, C1-C18 alkyl, C2-C18 alkenyl, or C2-C18 alkynyl, wherein R 10, R 11, R 13, R 14, R 15 and R 16, other than hydrogen, optionally contain at least one heteroatom, and R 10, R 11, R 13, R 14, R 15 and R 16, other than hydrogen, are optionally substituted; each occurrence of R 12 is independently C1-C18 alkyl, C1-C18 substituted alkyl, C2-C18 alkenyl, C2-C18 substituted alkenyl, C2-C18 alkynyl, C2-C18 substituted alkynyl, aryl, substituted aryl, wherein R 12 optionally contains at least one heteroatom; optionally any two of R 10, R 11, R 12, R 13, R 14, R 15, R 16 taken together form a ring being a substituted or unsubstituted, saturated or unsaturated cyclic structure; each occurrence of R 17 and R 18 is independently alkyl, substituted alkyl, aryl, or substituted aryl, wherein each of R 17 and R 18 optionally contains at least one heteroatom, and wherein R 17 and R 18 taken together optionally form a ring being a substituted or unsubstituted, saturated or unsaturated cyclic structure; each occurrence of R 19 and R 20 is independently a covalent bond that connects Si and C, an alkyl, substituted alkyl, or a heteroatom, wherein R 19 and R 20 optionally contain at least one heteroatom; wherein L 1 -L 2 bonds with G through unsaturated sites S 1 and S 2; and X is an anion; with the proviso that Formula does not encompass the following complexes: Iron, dichloro[N,N'-[(2,8-quinolinediyl-κN)diethylidyne]bis[2,6-dimethylbenzenamine-κN]]-, Cobalt, dichloro[N,N'-[(2,8-quinolinediyl-κN)diethylidyne]bis[2,6-dimethylbenzenamine-κN]]-, (SP-5-14)-, Iron, dichloro[N,N'-[(2,8-quinolinediyl-κN)diethylidyne]bis[2,4,6-trimethylbenzenamine-κN]]- and Cobalt, dichloro[N,N'-[(2,8-quinolinediyl-κN)diethylidyne]bis[2,4,6-trimethylbenzenamine-κN]]-.