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-kappa N-1(triphenylphosphine)gold-{3,5-bis[4-(octyloxy)phenyl]-1H-pyrazole}(

摘要

Compounds [{Au(pz(R2))(PPh3)}(2)] (pz(R2)=3,5-disubstituted pyrazolato; R=BuOC6H4 (bp), 1; R=C8H17OC6H4 (op), 2; R=C6H13OC6H4 (hp), 3) were easily obtained by reaction of [Au(NO3)(PPh3)] 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(R2))(PPh3)]. By contrast, 1 crystallizes as the dimer [{Au(pz(R2))(PPh3)}(2)] and exhibits aurophilic Au...Au contacts, while crystallization of 2 in CH2Cl2/hexane gives rise to compound 4, [Au(pz(op2))(PPh3)].(Hpz(op2)). The X-ray structure of 4 was solved, showing a H-bond interaction between the monomer of 2 and Hpz(op2). Reactions between [{Au(pz(R2))(PPh3)}(2)] and their corresponding 1H-pyrazole (Hpz(R2)) were also explored. Compounds 1-3 exhibit luminescence in the solid state. Their emission spectra are reported and analyzed.