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Updated: May 31, 2026
A Study of the Complexation of Mercury(II) with Dicysteinyl Tetrapeptides by Electrospray Ionization Mass Spectrometry
Published on: January 8, 2016
Mercury(II) thiolate complexes of two flexible benzimidazole-based ligands
Hai Shang1, Ai-Xia Zheng, Dong Liu
1Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People's Republic of China.
Abstract:
The structure of catena-poly[[{bis[4-(trimethylammonio)benzenethiolate-κS]mercury(II)}-μ-1,1'-(ethane-1,2-diyl)bis(1H-benzimidazole)-κ(2)N(3):N(3')] bis(hexafluoridophosphate) 0.25-hydrate], {[Hg(C(16)H(14)N(4))(C(9)H(13)NS)(2)](PF(6))(2)·0.25H(2)O}(n), contains a one-dimensional zigzag chain. The Hg(II) cation is coordinated by two S atoms of two 4-(trimethylammonio)benzenethiolate (Tab) ligands and by two N atoms from two different 1,1'-(ethane-1,2-diyl)bis(1H-benzimidazole) ligands, forming a distorted seesaw-shaped coordination geometry. The F atoms of the hexafluoridophosphate anion interact with the H atoms of the Tab ligand, generating a two-dimensional network. Furthermore, this layer is connected to neighbouring layers via H···π interactions, thereby forming a three-dimensional hydrogen-bonded structure. In catena-poly[[{[4-(trimethylammonio)benzenethiolate-κS]mercury(II)}bis[μ-4-(trimethylammonio)benzenethiolate-κ(2)S:S]{[4-(trimethylammonio)benzenethiolate-κS]mercury(II)}-μ-1,1'-(hexane-1,6-diyl)bis(1H-benzimidazole)-κ(2)N(3):N(3')] tetrakis(hexafluoridophosphate)], {[Hg(2)(C(20)H(22)N(4))(C(9)H(13)NS)(4)](PF(6))(4)}(n), each Hg(II) cation is coordinated by two S atoms of two Tab ligands and one N atom of the 1,1'-(hexane-1,6-diyl)bis(1H-benzimidazole) (hbbm) ligand, forming a distorted T-shaped coordination geometry, while longer secondary Hg···S bonds join two such units across a centre of inversion to give the tetravalent cation. Adjacent {[Hg(Tab)(2)](2)(μ-hbbm)}(4+) cations are linked through the centrosymmetric hbbm ligands to afford a one-dimensional chain extending along the b axis. Several F atoms interact with the H atoms of the Tab and hbbm ligands, while the S atom interacts with an aromatic H atom of a different Tab ligand, to afford a complex intra- and intermolecular hydrogen-bonding arrangement in a three-dimensional structure.
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