Inorganic Chemistry, Vol.38, No.8, 1900-1907, 1999
Alcohol and aldehyde adducts of zinc thiolates: Structural modeling of alcoholdehydrogenase
Bis(pentafluorothiophenolato)zinc (1) and bis(2,4,6-triisopropylthiophenolato)zinc (2) can be combined with nitrogen-containing derivatives of benzyl alcohol and benzaldehyde to form (N,O-chelate) zinc thiolates. 2-Pyridylmethanol as well as 2-quinolylmethanol (HetMeOH) yield [(HetMeO)Zn(SR)](4) (3, 4) having a cyclo-Zn-4(mu-O)(4) backbone and only terminal SR. Likewise, thiolate 1 and 2-(dimethylamino)benzyl alcohol form zwitterionic [(dimethylammoniobenzylato)Zn(SR)(2)](2) (5) with bridging alkoxide and terminal thiolate. In contrast, 6-picolylmethanol (PicMeOH) and thiolate 1 result in [(PicMeOH)Zn(SC6F5)(2)] (6) containing zinc in a tetrahedral ZnNS2O, environment. Simple aromatic aldehydes form polymeric complexes [(RCHO)Zn(SC6F5)(2)] (7: R = p-tolyl, 8: R = mesityl) with a [Zn-S](infinity) backbone. Chelating aldehydes (CA) yield mononuclear complexes with tetrahedral ZnNS2O coordination [(CA)Zn(SC6F5)(2)] (9, CA = pyridine-2-carbaldehyde; 10, CA = 6-methylpyridine-2-carbaldehyde: 11. CA = 6-methoxypyridine-2-carbaldehyde; 12, CA = quinoline-2-carbaldehyde; 13, CA = 2-(dimethylamino)benzaldehyde). In contrast, N-methylimidaznle-2-carbaldehyde (ImA) is coordinated twice in tetrahedral [(ImA)(2)Zn(SC6F5)(2)] (14) lacking any Zn-O interactions, Pyridine-2,6-dicarbaldehyde (PDA) forms trigonal bipyramidal [(PDA)Zn(SC6F5)(2)] (15) with ZnNO2S2 ligation, The structures of 3. 4, 6, 8, 10, 11, 13, and 14 were determined crystallographically, and the structures of 5 and 15 were deduced from those of the corresponding ZnBr2 complexes. The ZnNS2O coordination pattern observed for the enzyme has been reproduced to a very good approximation. In complexes 6 and 10, which are almost superimposable, it is realized for both the corresponding alcohol and aldehyde.
Keywords:CRYSTAL-STRUCTURES;CHALCOGENOLATO COMPLEXES;DEHYDROGENASE;LIGANDS;COORDINATION;BINDING;SITE