An organometallic complex having the structure of formula wherein: M is a Group 8 transition metal; L 1 and L 2 are neutral electron donor ligands; X 1 and X 2 are anionic ligands; R 1 is hydrogen, C 1 -C 12 hydrocarbyl, or substituted C 1 -C 12 hydrocarbyl; W is an optionally substituted and/or heteroatom-containing C 1 -C 20 hydrocarbylene linkage; Y is a positively charged Group 15 or Group 16 element substituted with hydrogen, C 1 -C 12 hydrocarbyl, substituted C 1 -C 12 hydrocarbyl, heteroatom-containing C 1 -C 12 hydrocarbyl, or substituted heteroatom-containing C 1 -C 12 hydrocarbyl; Z- is a negatively charged counterion; m is zero or 1; and n is zero or 1; wherein any two or more of L 1, L 2, X 1, X 2, R 1, W, and Y can be taken together to form a cyclic group and wherein, unless otherwise specified, substituted means that one or more hydrogen atom is replaced with one or more substituent selected from the group consisting of halo, hydroxyl, sulfhydryl, C 1 -C 20 alkoxy, C 2 -C 20 alkenyloxy, C 2 -C 20 alkynyloxy, C 5 -C 20 aryloxy, C 6 -C 20 aralkyloxy, C 6 -C 20 alkaryloxy, acyl (including C 2 -C 20 alkylcarbonyl (-CO-alkyl) and C 6 -C 20 arylcarbonyl (-CO-aryl)), acyloxy (-O-acyl, including C 2 -C 20 alkylcarbonyloxy (-O-CO-alkyl) and C 6 -C 20 arylcarbonyloxy (-O-CO-aryl)), C 2 -C 20 alkoxycarbonyl (- -O-alkyl), C 6 -C 20 aryloxycarbonyl (- -O-aryl), halocarbonyl (-CO)-X where X is halo), C 2 -C 20 alkylcarbonato (-O- -O-alkyl), C 6 -C 20 arylcarbonato (-O- -O-aryl), carboxy (-COOH), carboxylato (-COO -), carbamoyl (- -NH 2), mono-(C 1 -C 20 alkyl)-substituted carbamoyl (- -NH(C 1 -C 20 alkyl)), di-(C 1 -C 20 alkyl)-substituted carbamoyl (- -N(C 1 -C 20 alkyl) 2), mono-(C 5 -C 20 aryl)-substituted carbamoyl (- -NH-aryl), di-(C 5 -C 20 aryl)-substituted carbamoyl (- -N(C 5 -C 20 aryl) 2), di-N-(C 1 -C 20 alkyl), N-(C 5 -C 20 aryl)-substituted carbamoyl, thiocarbamoyl (- -NH 2), mono-(C 1 -C 20 alkyl)-substituted thiocarbamoyl (- -NH(C 1 -C 20 alkyl)), di-(C 1 -C 20 alkyl)-substituted thiocarbamoyl (- -N(C 1 -C 20 alkyl) 2), mono-(C 5 -C 20 aryl)-substituted thiocarbamoyl (- -NH-aryl), di-(C 5 -C 20 aryl)-substituted thiocarbamoyl (- -N(C 5 -C 20 aryl) 2), di-N-(C 1 -C 20 alkyl), N-(C 5 -C 20 aryl)-substituted thiocarbamoyl, carbamido (-NH- -NH 2), cyano(-C=N), cyanato (-O-C=N), thiocyanato (-S-CΞN), isocyano (-N+ΞC -), formyl (- -H), thioformyl (- -H), amino (-NH 2), mono-(C 1 -C 20 alkyl)-substituted amino, di-(C 1 -C 20 alkyl)-substituted amino, mono-(C 5 -C 20 aryl)-substituted amino, di-(C 5 -C 20 aryl)-substituted amino, C 2 -C 20 alkylamido (-NH- -alkyl), C 6 -C 20 arylamido (-NH- -aryl), imino (-CR=NH where R = hydrogen, C 1 -C 20 alkyl, C 5 -C 20 aryl, C 6 -C 20 alkaryl, C 6 -C 20 aralkyl, etc.), C 2 -C 20 alkylimino (-CR=N(alkyl), where R = hydrogen, C 1 -C 20 alkyl, C 5 -C 20 aryl, C 6 -C 20 alkaryl, C 6 -C 20 aralkyl, etc.), arylimino (-CR=N(aryl), where R = hydrogen, C 1 -C 20 alkyl, C 5 -C 20 aryl, C 6 -C 20 alkaryl, C 6 -C 20 aralkyl, etc.), nitro (-NO 2), nitroso (-NO), sulfo (-SO 2 -OH), sulfonato (-SO 2 -O -), C 1 -C 20 alkylsulfanyl (-S-alkyl; also termed "alkylthio"), C 5 -C 20 arylsulfanyl (-S-aryl; also termed "arylthio"), C 1 -C 20 alkyldithio (-S-S-alkyl), C 5 -C 20 aryldithio (-S-S-aryl), C 1 -C 20 alkylsulfinyl (- -alkyl), C 5 -C 20 arylsulfinyl (- -aryl), C 1 -C 20 alkylsulfonyl (-SO 2 -alkyl), C 5 -C 20 arylsulfonyl (-SO 2 -aryl), boryl (-BH 2), borono (-B 2), boronato (-B 2 where R is alkyl or other hydrocarbyl), phosphono (-P 2), phosphonato (-P (O-) 2), phosphinato (-P (O -)), phospho (-PO 2), phosphino (-PH 2), silyl (-SiR 3 wherein R is hydrogen or hydrocarbyl), and silyloxy (-O-silyl); and the hydrocarbyl moieties C 1 -C 20 alkyl (preferably C 1 -C 12 alkyl, more preferably C 1 -C 6 alkyl), C 2 -C 20 alkenyl (preferably C 2 -C 12 alkenyl, more preferably C 2 -C 6 alkenyl), C 2 -C 20 alkynyl (preferably C 2 -C 12 alkynyl, more preferably C 2 -C 6 alkynyl), C 5 -C 20 aryl (preferably C 5 -C 14 aryl), C 6 -C 20 alkaryl (preferably C 6 -C 16 alkaryl), and C 6 -C 20 aralkyl (preferably C 6 -C 16 aralkyl), and wherein the term 'heteroatom-containing' means that one or more carbon is replaced with an atom independently selected from N, O, S, P or Si. M is a Group 8 transition metal; L 1 and L 2 are neutral electron donor ligands; X 1 and X 2 are anionic ligands; R 1 is hydrogen, C 1 -C 12 hydrocarbyl, or substituted C 1 -C 12 hydrocarbyl; W is an optionally substituted and/or heteroatom-containing C 1 -C 20 hydrocarbylene linkage; Y is a positively charged Group 15 or Group 16 element substituted with hydrogen, C 1 -C 12 hydrocarbyl, substituted C 1 -C 12 hydrocarbyl, heteroatom-containing C 1 -C 12 hydrocarbyl, or substituted heteroatom-containing C 1 -C 12 hydrocarbyl; Z- is a negatively charged counterion; m is zero or 1; and n is zero or 1;