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Methylation of Tethered Thiolates in [(bme-daco)Zn]2 and [(bme-daco)Cd]2 as a Model of Zinc Sulfur-Methylation Proteins

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Department of Chemistry, Texas A&M University, College Station, Texas 77843
Cite this: Inorg. Chem. 1998, 37, 16, 4052–4058
Publication Date (Web):July 17, 1998
https://doi.org/10.1021/ic971599f
Copyright © 1998 American Chemical Society
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    The dimeric dithiolate complex [1,5-bis(mercaptoethyl)-1,5-diazacyclooctanato]zinc(II), [(bme-daco)Zn]2 or Zn-1, and its cadmium analogue, Cd-1, were investigated as models for the active site of zinc-dependent methylation proteins. The key issue addressed was whether alkylation of a thiolate in a relatively rigid tetradentate ligand would result in coordination of the thioether product to the metal. On the basis of 1H and 13C NMR spectroscopy and similar reactivity toward alkylating agents, the newly synthesized cadmium complex, Cd-1, is proposed to be isostructural with the previously reported Zn-1 complex, which is known from X-ray crystallography to be dimeric in the solid state (Tuntulani, T.; Reibenspies, J. H.; Farmer, P. J.; Darensbourg, M. Y. Inorg. Chem. 1992, 31, 3497). Iodomethane reacts with Zn-1 in hot CH3OH/CH3CN to produce a thioether which dissociates, replaced by coordination of iodide in the pseudotetrahedral complex, (Me2bme-daco)ZnI2 or Zn-2. Complex Zn-2 crystallizes in the triclinic P1̄ space group with a = 7.911(2) Å, b = 10.675(2) Å, c = 12.394(2) Å, α = 75.270(10)°, β = 75.270(10)°, γ = 82.12(2)°, V = 998.270 Å3, and Z = 2. An analogous reaction was observed for the cadmium derivative, Cd-1, which displays a 1H NMR spectrum identical to that of Zn-2. In attempts to promote thioether binding, the iodide was displaced by addition of AgBF4 to solutions of Zn-2 or the BF4- analogue was synthesized directly from Zn(BF4)2 and methylated ligand, Me2bme-daco, to yield Zn-3. Similar reactions with the cadmium analogue yielded a product identified as Cd-3 that was indistinguishable from Zn-3 by 1H NMR. The 113Cd NMR spectra of Cd-3 displayed a single resonance at 88 ppm consistent with a hard donor environment and inconsistent with sulfur binding. As a further attempt to induce thioether binding to zinc, the macrocyclization reagent 1,3-dibromopropane was added to Zn-1. The resulting product, [BrZn(macrocycle)]+, was only slightly soluble in pyridine and identified by +FAB/MS as the desired macrocyclic product with a large amount of free macrocycle ligand. Recrystallization from pyridine/ether resulted in loss of the zinc as Zn(py)2Br2, which was obtained as colorless crystals and characterized by X-ray crystallography. Complex Zn(py)2Br2 crystallizes in the monoclinic P21/c space group with a = 8.534(2) Å, b = 18.316(4) Å, c = 8.461(2) Å, β = 101.07(3)°, V = 1297.9(5) Å3, and Z = 4.

    †

     Current address:  Department of Chemistry, Chulalongkorn University, Bangkok, Thailand 10330.

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    In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

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    Tables of crystallographic data collection parameters, atomic coordinates and equivalent isotropic displacement parameters, complete bond lengths and bond angles, and anisotropic displacement parameters and packing diagrams for Zn-2 and Zn(py)2Br2 (17 pages). Ordering information is given on any current masthead page.

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