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Abstract
The coordination behavior of the 2,6-dimethanol pyridine (H2-pdm) with Group 4 and 5 metal alkoxides was undertaken through a series of alcoholysis reactions. The products were crystallographically identified as: (OR)2M(μ2-pdm)[(μ-pdm)M(OR)2]2 (M = Ti, OR = OPri (1 · py), ONep (2 · HONep, tol); Zr, OBut (3)), [M3(μ3-pdm)(μ-pdm)2(μ-ONep)2(ONep)4] (M = Zr (4), Hf (5)), [M(μ-pdm)(OR)3]2 [M/OR = Nb/OEt (6), and Ta/ONep (7)] where μ = η1,η1,η2(O,N,O′), μ2 = η2,η1,η2(O,N,O′), μ3 = η1,η1,η3(O,N,O′), OEt = OCH2CH3, OPri = OCH(CH3)2, OBut = OC(CH3)3, and ONep = OCH2C(CH3)3. For each complex, pdm was a bichelating (O,N,O′) ligand generating trinuclear species coupled with a variety of additional bridging modes: μ, μ2, and μ3. Further analyses by multinuclear and DOSY NMR studies indicated that the structures were retained in solution.
Graphical abstract
The coordination behavior of 2,6-dimethanolpyridine (H2-pdm) with Group 4 and 5 metal alkoxides was crystallographically determined. The pdm ligand was found to undergo a variety of tridentate, bridging coordination configurations: (OR)2 M(μ2–pdm)[(μ–pdm)M(OR)2]2 (shown), M3(μ3–pdm)(μ–pdm)2(OR)6, or [M(μ–pdm)(OR)3]2.
Acknowledgments
This work was supported by the Laboratory Directed Research and Development (LDRD) programs at Sandia National Laboratories and the National Science Foundation CRIF:MU award to Prof Kemp of the University of New Mexico (CHE04-43580) for purchase of a Bruker X-ray diffractometer. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the US Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000.
Disclosure statement
No potential conflict of interest was reported by the authors.
