Pyrazole complexes as anion receptors

INOR 167

Lucía Riera, lr252@cam.ac.uk1, Sonia Nieto1, Víctor Riera, vrg@uniovi.es1, Julio Pérez, japm@uniovi.es1, and Daniel Miguel, dmsj@qi.uva.es2. (1) Facultad de Química, Universidad de Oviedo-CSIC, Departamento de Química Orgánica e Inorgánica-IUQOEM, Julián Clavería, 8, 33006 Oviedo, Spain, (2) Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47071 Valladolid, Spain
The design of supramolecular receptors of anions based on hydrogen-bond interactions is an area of much current interest. Herein we report a new class of transition metal-based supramolecular anion receptors of general formula [LnM(Hpz)3]BAr′4, that display the following common and novel features: (a) a facial disposition of the three pyrazoles,so they can be thought of as the reverse of the tris(pyrazolyl)borates a widely employed family of ligands (see Figure); (b) the presence of the tetraarylborate BAr′4- as counteranion, that minimizes the competition with the external anions and enhances the solubility in moderately polar organic solvents and (c) the integrity of the complexes in the presence of external anions can be readily ascertained by observing the ν(CO) bands occurring in the IR spectrum.

The behaviour of the metalloreceptors [LnM(Hpz)3]+ towards several anions has been studied both in solution (1H NMR titrations) and in the solid state (X-ray diffraction).

 

Applications of Organometallic Chemistry
7:00 PM-10:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007