title: A new family of flexible scorpionate ligands based on 2-mercaptopyridine.
abstract: A new family of flexible scorpionate ligands based on 2-mercaptopyridine is reported. The tris- and bis-substituted ligands, K[HB(mp)(3)] (1) and Na[H(2)B(mp)(2)] (2) (mp = 2-mercaptopyridine) have been prepared and fully characterised. The structural characterisation of 1 reveals an unprecedented mu(3)-kappa(3)-SS'H-eta(1)eta(1)eta(2)-kappa(2)-S''C-eta(1)eta(1)-kappa(1)-S'-eta(1) coordination mode. The coordination of both 1 and 2 to copper(I) complexes containing triphenylphosphine and tricyclohexylphosphine co-ligands is investigated suggesting kappa(3)-SSS coordination modes for [Cu{HB(mp)(3)}(PR(3))] {where R = Ph (3); R = Cy, (4)} and kappa(3)-SSH coordination modes for [Cu{H(2)B(mp)(2)}(PR(3))] {where R = Ph (5); R = Cy (6)} the latter confirmed by structural characterisation of 5. A structural comparison with the sulfur based scorpionates, HB(mt)(3) and H(2)B(mt)(2) (mt = methyl-2-mercaptoimidazole) is made in terms of the degree of tautomerisation of the heterocyclic rings.
authors.affiliation: The School of Chemistry, University of Bristol, Cantock's Close, Bristol, UK BS8 1TS.
authors.forename: Gavin
authors.initials: G
authors.lastname: Dyson
authors.forename: Alex
authors.initials: A
authors.lastname: Hamilton
authors.forename: Byron
authors.initials: B
authors.lastname: Mitchell
authors.forename: Gareth R
authors.initials: GR
authors.lastname: Owen
mesh_terms: D018360:Crystallography, X-Ray; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D011725:Pyridines; C029347:2-thiopyridine