Aurophilic towards H-Bonding Interactions in Phosphine-pyrazolato-gold(I) Complexes: Luminescence Studies and Crystal Structure of {3,5-Bis[4-(octyloxy)phenyl]-1H-pyrazolato-κN1}(triphenylphosphine)gold{3,5-Bis[4-(octyloxy)phenyl]-1H-pyrazole} ([Au(pz)(PPh3)]⋅(Hpz))

✍ Scribed by Paloma Ovejero; Mercedes Cano; José A. Campo; José V. Heras; Antonio Laguna; Olga Crespo; Elena Pinilla; M. Rosario Torres

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: German
• Weight: 304 KB
• Volume: 87
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.200490184

✦ Synopsis

Abstract

Compounds [{Au(pz)(PPh~3~)}~2~] (pz=3,5‐disubstituted pyrazolato; R=BuOC~6~H~4~ (bp), 1; R=C~8~H~17~OC~6~H~4~ (op), 2; R=C~6~H~13~OC~6~H~4~ (hp), 3) were easily obtained by reaction of [Au(NO~3~)(PPh~3~)] and the corresponding pyrazolato ligand. They exhibit similar NMR patterns, their ESI‐MS or FAB‐MS data being in agreement with a monomeric molecular formulation [Au(pz)(PPh~3~)]. By contrast, 1 crystallizes as the dimer [{Au(pz)(PPh~3~)}~2~] and exhibits aurophilic Au ⋅⋅⋅Au contacts, while crystallization of 2 in CH~2~Cl~2~/hexane gives rise to compound 4, [Au(pz)(PPh~3~)]⋅(Hpz). The X‐ray structure of 4 was solved, showing a H‐bond interaction between the monomer of 2 and Hpz. Reactions between [{Au(pz)(PPh~3~)}~2~] and their corresponding 1__H__‐pyrazole (Hpz) were also explored. Compounds 1–3 exhibit luminescence in the solid state. Their emission spectra are reported and analyzed.