Synthesis and coordination chemistry of an alkyne functionalised bis(pyrazolyl)methane ligand

摘要

The alkyne functionalised bidentate N-donor ligand (2-propargyloxyphenyl)bis(pyrazolyl)methane (L) was prepared in high yield from the reaction of (2-hydroxyphenyl)bis(pyrazolyl)methane with propargyl bromide in the presence of base. A series of transition-metal complexes including [MCl2L] (M = Cu, Co, Ni, Zn, Pt), [ML2](NO3)(2) (M = Cu, Co, Ni, Zn), [AgL]NO3 and [Pd(L)(dppe)](OTf)(2) were prepared and characterised by spectroscopic techniques. In addition, ligand L as well as the Co(II) and Zn(II) complexes [CoCl2L](2), [ZnCl2L] were structurally characterized by single-crystal X-ray diffraction. The organometallic gold(I) and platinum(II) acetylide complexes [Pz(2)CH(C6H4-2-OCH2C=CAuPPh3)] and trans-[{Pz(2)CHC(6)H(4)-2-OCH2C=C}(2)Pt(PPh3)(2)] were prepared from L and [AuCl(PPh3)] and trans-[PtCl2(PPh3)(2)], respectively Treatment of these complexes with [Pd(OTf)(2)(dppe)] or [Cu(MeCN)(4)]PF6 results in formation of the cationic, mixed-metal complexes, which were isolated (Pt/Pd, Au/Pt) or detected by electrospray mass spectrometry (Au/Cu, Pt/Cu).