20-21 November 2014
National Centre for Synchrotron Science
Australia/Melbourne timezone
Save the date: User Meeting 2015 - 26-27 November

New Formamidinate Rare Earth Metal Complexes by Pseudo-Grignard Reaction

20 Nov 2014, 17:30
1h 30m
NCSS Exhibition Area ()

NCSS Exhibition Area

Australian Synchrotron 800 Blackburn Road Clayton VIC 3168
Board: 101


Mr Safaa Ali (James Cook University)


Pseudo-Grignard reagents1, 2, ‘‘RLnX’’ (Ln = Eu, Sm and Yb; R = Me, Ph or C6H2Me3-2, 4, 6; X = Br, I), formed by the treatment of organic halides like PhBr or PhI with rare earth metals in Lewis base solvents, can be employed to various organic or inorganic transformations3, 4. We now report the synthesis of new divalent rare earth metal formamidinate complex [Ln(Form)Br(thf)2]2 through the relevant Pseudo-Grignard reactions of rare earth metal with bromobenzene in the presence of formamidine (Eq. 1). A typical reaction using ytterbium metal and bromobenzene or iodobenzene in the presence of 2,4,6-methylformamidine led to the isolation of orange and light orange complexes [Yb(Form)Br(thf)2]2, [Yb(Form)I(thf)2]2. The product has been structurally characterized including X-ray crystallography (Fig. 1). Fig. 1. Molecular structure of [Yb(Form)Br(thf)2]2 Fig. 2. Molecular structure of [Yb(Form)I(thf)2]2 References 1. Syutkina, O. P.; Rybakova, L. F.; Petrov, E. S.; Beletskaya, I. P., J. Organomet. Chem., 1985, 280, C67. 2. Petrov, E. S.; Roitershtein, D. M.; Rybakova, L. F., J. Organomet. Chem., 2002, 647, 21. 3 Evans, D. F.; Fazakerley, G. V. ; Phillips, R. F., J. Chem. Soc. D., 1970, 244. 4. Evans, D. F.; Fazakerley, G. V. ; Phillips, R. F., J. Chem. Soc. A., 1971, 1931.
Keywords or phrases (comma separated) Formamidine, Rare earth, organolanthanoid, Pseudo-Grignard

Primary author

Mr Safaa Ali (James Cook University)


Dr Jun Wang (James Cook University) Prof. Peter Junk (James Cook university)

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