ABSTRACT
The addition of flexible scorpionate ligand, [mpBm]â»{i.e. HB(mt)2(mp), where mt = methyl-2-mercaptoimidazole and mp = 2-mercaptopyridine} to group eleven centres is reported for the first time. The coordination of this hybrid ligand to copper(I) and silver(I) centres in the presence of triphenylphosphine and trialkylphosphine co-ligands has been investigated. The trialkylphosphines coordinates to both copper and silver centres while the less basic triarylphosphine only successfully coordinates to the copper centre. Structural characterisation of [Cu{HB(mt)2(mp)}(PPh3)], [Cu{HB(mt)2(mp)}(PCy3)] and [Ag{HB(mt)2(mp)}(PCy3)] confirm κ³-SSH coordination modes for ligand where one of the mt 'arms' and the mp 'arm' of the scorpionate ligand are coordinated to the metal centre. The second mt 'arm' remains uncoordinated in all three complexes. A comparison has been made with the parent sulfur based scorpionate ligand, [Tm]â»{HB(mt)3}.
ABSTRACT
The first structurally characterised zerovalent platinum complex to contain a tridentate pincer-type coordination mode (kappa(3)-SBS) is presented, raising further questions concerning the geometries and trans influence of Z-type ligands.
ABSTRACT
A new boron-based hybrid scorpionate ligand based upon one 2-mercaptopyridine (mp) and two 1-methyl-imidazoyl-2-thione (mt) units, Na[HB(mt)(2)(mp)] has been prepared. This new ligand together with the recently reported ligand K[HB(mp)(3)] have been used to prepare analogues of the original metallaboratrane complex [Ru(CO)(PPh(3)){kappa(4)-SSBS-B(mt)(3)}]. The effect of tautomerisation of the ligand arms upon the electronic properties of the boron and metal centres is examined in an attempt to probe further the nature of the metal-boron bond within metallaboratrane complexes.
