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Complexes of Ag(i), Hg(i) and Hg(ii) with multidentate pyrazolyl-pyridine ligands: From mononuclear complexes to coordination polymers via helicates, a mesocate, a cage and a catenate

Lookup NU author(s): Emeritus Professor Bill Clegg, Dr Ross Harrington



The coordination chemistry of a series of di- and tri-nucleating ligands with Ag(i), Hg(i) and Hg(ii) has been investigated. Most of the ligands contain two or three N,N′-bidentate chelating pyrazolyl-pyridine units pendant from a central aromatic spacer; one contains three binding sites (2 + 3 + 2-dentate) in a linear sequence. A series of thirteen complexes has been structurally characterised displaying a wide range of structural types. Bis-bidentate bridging ligands react with Ag(i) to give complexes in which Ag(i) is four-coordinate from two bidentate donors, but the complexes can take the form of one-dimensional coordination polymers, or dinuclear complexes (mesocate or helicate). A tris-bidentate triangular ligand forms a complicated two-dimensional coordination network with Ag(i) in which Ag⋯Ag contacts, as well as metal-ligand coordination bonds, play a significant role. Three dinuclear Hg(i) complexes were isolated which contain an {Hg2} 2+ metal-metal bonded core bound to a single bis-bidentate ligand which can span both metal ions. Also characterised were a series of Hg(ii) complexes comprising a simple mononuclear four-coordinate Hg(ii) complex, a tetrahedral HgII4 cage which incorporates a counter-ion in its central cavity, a trinuclear double helicate, and a trinuclear catenated structure in which two long ligands have spontaneously formed interlocked metallomacrocyclic rings thanks to cyclometallation of two of the Hg(ii) centres. © The Royal Society of Chemistry 2006.

Publication metadata

Author(s): Argent SP, Adams H, Riis-Johannessen T, Jeffery JC, Harding LP, Clegg W, Harrington RW, Ward MD

Publication type: Article

Publication status: Published

Journal: Dalton Transactions

Year: 2006

Issue: 42

Pages: 4996-5013

Print publication date: 01/01/2006

Date deposited: 09/07/2010

ISSN (print): 1477-9226

ISSN (electronic): 1477-9234

Publisher: Royal Society of Chemistry


DOI: 10.1039/b607541j


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