Abstract
Borohydride ligands featuring multiple pendant donor functionalities have been prevalent in the chemical literature for many decades now. More recent times has seen their development into new families of so-called soft scorpionates, for example, those featuring sulfur based donors. Despite all of these developments, those ligands containing just one pendant group are rare. This article explores one ligand family based on the 2-mercaptopyridine heterocycle. The coordination chemistry of the monosubstituted ligand, [H3B(mp)]− (mp = 2-mercaptopyridyl), has been explored. Reaction of Na[BH3(mp)] with one equivalent of Cu(I)Cl in the presence of either triphenylphosphine or tricyclohexylphosphine co-ligands leads to the formation of [Cu{H3B(mp)}(PR3)] (R = Ph, 1; Cy, 2), respectively. Structural characterization confirms a κ3-S,H,H coordination mode for the borohydride-based ligand within 1 and 2, involving a dihydroborate bridging interaction (BH2Cu) with the copper centers.
Highlights
The coordination chemistry of borohydride and substituted borohydride units with transition metals has been a major focus of research over many decades [1,2,3,4,5,6,7,8,9]
As part of our research, we have focused on providing new derivative borohydride ligands containing a range ofresearch, supporting units based on nitrogen
In 2009, we introduced a new family of flexible scorpionate ligands derived from the sulfur heterocycles
Summary
The coordination chemistry of borohydride and substituted borohydride units with transition metals has been a major focus of research over many decades [1,2,3,4,5,6,7,8,9]. One particular focus of research has been on substituted borohydride units attached to other donor functional groups. This gave rise to a research area known as “scorpionate chemistry”, where the borohydride moiety is typically substituted by two or more pyrazolyl rings, forming multidentate ligand systems. This area of research has provided an expansive and fascinating array of compounds with wide ranging applications. The polyprazolylborates, for example, are known as “octahedral enforcers”, furnishing highly rigid stable complexes
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