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The Chelating Ligand 1,3‐Bis(pyrazol‐1′‐yl)propane (Bpp) Enforces a Tetrahedral Geometry in Both Cu II and Cu I Species
Author(s) -
Flinzner Kristel,
Stassen Arno F.,
Mills Allison M.,
Spek Anthony L.,
Haasnoot Jaap G.,
Reedijk Jan
Publication year - 2003
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200390093
Subject(s) - chemistry , copper , ligand (biochemistry) , tetrafluoroborate , crystallography , chelation , pyrazole , tetrahedral molecular geometry , metal , coordination sphere , crystal structure , inorganic chemistry , stereochemistry , organic chemistry , catalysis , biochemistry , ionic liquid , receptor
The ligand 1,3‐bis(pyrazol‐1 ′ ‐yl)propane (bpp) has been prepared by reacting 1,3‐dichloropropane with two equivalents of pyrazole. After reaction of bpp with copper( II ) tetrafluoroborate, three different compounds were obtained, two with Cu II and one with Cu I as cation, depending on the preparative method. The formation of single crystals of these compounds was only observed when 1‐(3‐chloropropyl)pyrazole (ppc) was present in the solution. The single‐crystal X‐ray structures of [Cu(bpp) 2 ](BF 4 ) 2 and [Cu(bpp) 2 ](BF 4 ) show that bpp acts as a didentate chelating ligand to form an uncommon eight‐atom chelate ring with the copper ion. Two polymorphs of the Cu II complex were characterized. In each of them, the metal atoms possess a distorted tetrahedral geometry. In the copper( I ) complex the metal center is present in a less‐distorted tetrahedral coordination sphere. The spectroscopic properties of the compounds are in agreement with the structural data. Cyclic voltammetry measurements showed a redox wave at 0.92 V vs. Ag/AgCl. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)