Synthesis and molecular structures of Yb{sup II} and Ca bis(amidinate) complexes containing the tridentate amidinate ligand [2,6-Pr{sup i}{sub 2}C{sub 6}H{sub 3}NC(But)NC{sub 6}H{sub 4}OMe-2]
- Russian Academy of Sciences, G. A. Razuvaev Institute of Organometallic Chemistry (Russian Federation)
New bis(amidinate) complexes of calcium, [2,6-Pr{sup i}{sub 2}C{sub 6}H{sub 3}NC(But)NC{sub 6}H{sub 4}OMe-2]{sub 2}Ca(DME) (2), and divalent ytterbium, [2,6-Pr{sup i}{sub 2}C{sub 6}H{sub 3}NC(But)NC{sub 6}H{sub 4}OMe-2]{sub 2}Yb (4), were synthesized by the transamination of the bis(amide) derivatives [(Me{sub 3}Si){sub 2}N]{sub 2}M(THF){sub 2} (M = Ca, Yb) with two equivalents of amidine 2,6-Pr{sup i}{sub 2}C{sub 6}H{sub 3}N=C(But)N(H)C{sub 6}H{sub 4}OMe-2, in which one nitrogen atom bears an o-methoxyphenylene moiety capable of coordinating a metalion. An X-ray diffraction study showed that, despite very similar ionic radii of Ca{sup 2+} and Yb{sup 2+}, the amidinate ligands in complexes 2 and 4 bind to these ions in different coordination modes. In the calcium complex, both ligands adopt a κ{sup 2}-N, O-chelating coordination mode. In the divalent ytterbium compound, one ligand is chelating and binds to the metalion in a κ{sup 2}-N, O-coordination mode, while the second ligand is coordinated via both the N and O (κ{sup 2}) atoms and the arene ring of the 2,6-Pr{sup i}{sub 2}C{sub 6}H{sub 3} moiety (η{sup 6}-coordination mode).
- OSTI ID:
- 22863362
- Journal Information:
- Russian Chemical Bulletin, Vol. 67, Issue 3; Other Information: Copyright (c) 2018 Springer Science+Business Media, LLC, part of Springer Nature; Country of input: International Atomic Energy Agency (IAEA); ISSN 1066-5285
- Country of Publication:
- United States
- Language:
- English
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