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Volume: 43 | Article ID: art00016
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The Crystal and Molecular Structure of the Tetrameric Methyl-2-mercaptobenzimidazole·AgBr (Acetone Solvate) Complex: Mode of Complex Formation Between Silver Bromide and Thione Type Photographic Stabilizers
  DOI :  10.2352/J.ImagingSci.Technol.1999.43.5.art00016  Published OnlineSeptember 1999
Abstract

The complex formed from the reaction of an important thione based stabilizer in conventional silver halide photography, methyl- 2-mercaptobenzimidazole (MBI), and silver bromide has been isolated for the first time as a single crystal and characterized by X-ray structure techniques. The resulting compound is tetrameric and has the formulation [AgBr·MBI]4 and also contains residual solvent from the crystallization process. The crystal and molecular structure of [AgBr·MBI]4 consists of intertwined dimers of [AgBr]2 four-membered rings that connect the foundational silver-ercaptobenzimidazole [AgS]4 eight-membered rings into a high molecular weight polymeric network superstructure. The complex demonstrates the powerful silver halide solubilization properties of the thiourea type ligand. The bridging sulfur remains in the thione form and N-H…Br-Ag hydrogen bonds suggest the title complex is an intermediate in the formation of the deprotonated AgMBI complex. Normal Ag-Br and Ag-S bond lengths were found: Ag-S = 2.5026(8), Ag-Br = 2.7423(9) and 2.7956(10) Å, C9.50H11AgBrN2O0.50S, Cell Data: I41/amd, a = 19.1034(2) Å, b = 19.1034(2) Å, c = 13.5019(2) Å.

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D. R. Whitcomb, R. D. Rogers, "The Crystal and Molecular Structure of the Tetrameric Methyl-2-mercaptobenzimidazole·AgBr (Acetone Solvate) Complex: Mode of Complex Formation Between Silver Bromide and Thione Type Photographic Stabilizersin Journal of Imaging Science and Technology,  1999,  pp 498 - 502,  https://doi.org/10.2352/J.ImagingSci.Technol.1999.43.5.art00016

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