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[H2B(mp)2] (2) (mp = 2-mercaptopyridine) have been prepared and fully characterised. The structural characterisation of 1 reveals an unprecedented μ3-κ3-SS′H- η1η1η2-κ2- S″C-η1η1-κ1-S′- η1 coordination mode. The coordination of both 1 and 2 to copper(i) complexes containing triphenylphosphine and tricyclohexylphosphine co-ligands is investigated suggesting κ3-SSS coordination modes for [Cu{HB(mp)3}(PR3)] {where R = Ph (3); R = Cy, (4)} and κ3-SSH coordination modes for [Cu{H2B(mp) 2}(PR3)] {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 H2B(mt)2 (mt = methyl-2-mercaptoimidazole) is made in terms of the degree of tautomerisation of the heterocyclic rings.
Original language | English |
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Pages (from-to) | 6120-6126 |
Number of pages | 7 |
Journal | Dalton Transactions |
Issue number | 31 |
DOIs | |
Publication status | Published - 10 Aug 2009 |
Externally published | Yes |