New Tris(pyrazolyl)triazine and Pyrazolylpyridine Gold( I ) and Palladium( II ) Derivatives Based on the 3,5‐Bis(4‐butoxyphenyl)pyrazole Group − Architectures with Different Types of Bonding Interactions

The 3,5‐bis(4‐butoxyphenyl)pyrazolyl group (Pz bp2 ) has been used as a building block for mono‐ and polymetallic derivatives of 2,4,6‐tris[3,5‐bis(4‐butoxyphenyl)pyrazol‐1‐yl]‐1,3,5‐triazine (TPz bp2 Tz, 1 ), 2‐[3,5‐bis(4‐butoxyphenyl)pyrazol‐1‐yl]pyridine (Pz bp2 Py, 2 ), and 3,5‐bis(4‐butoxyphenyl)pyrazole (HPz bp2 , 3 ) ligands. The synthesis and characterisation of the new hexadentate ligand 1 are described, together with the chemistry of its metal complexes containing [Pd(η 3 ‐C 3 H 5 )] + and [Au(PPh 3 )] + fragments. The related complexes containing Pz bp2 Py ( 2 ) were also studied and their structural characteristics were compared to those of the TPz bp2 Tz species. The role of the counter‐ion on the supramolecular assembly of complexes containing the HPz bp2 ligand 3 was made clear by the X‐ray structures of [Pd(η 3 ‐C 3 H 5 )(HPz bp2 ) 2 ](BF 4 ) and [Au(HPz bp2 )(PPh 3 )](NO 3 ). Hydrogen bonds and/or bonding interactions are responsible for pseudohelical one‐dimensional polymers or supramolecular columnar arrays, respectively. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)