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Synthesis and Structure of Aminopyridinato‐Stabilized Yttrium and Lanthanum Amides and Their Reactivity towards Alkylaluminium Compounds
Author(s) -
Döring Christian,
Kempe Rhett
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800934
Subject(s) - chemistry , lanthanide , lanthanum , amine gas treating , ethylene , polymer chemistry , tetrahydrofuran , medicinal chemistry , yttrium , crystal structure , reactivity (psychology) , ligand (biochemistry) , methyllithium , polymerization , inorganic chemistry , organic chemistry , catalysis , ion , medicine , oxide , biochemistry , polymer , alternative medicine , receptor , pathology , solvent
A series of aminopyridinato‐stabilized (amido)lanthanide complexes has been synthesized and characterized. The bulky aminopyridines (2,6‐diisopropylphenyl)[6‐(2,4,6‐triisopropylphenyl)pyridin‐2‐yl]amine ( 1a ) and [6‐(2,4,6‐triisopropylphenyl)pyridin‐2‐yl](2,4,6‐trimethylphenyl)amine ( 1b ) were introduced by amine elimination reaction with [Ln{N(SiHMe 2 ) 2 } 3 (thf) 2 ] (Ln = Y, La, thf = tetrahydrofuran, Me = methyl) to obtain the corresponding mono(aminopyridinato) complexes. Single‐crystal X‐ray analyses were carried out for the yttrium derivatives. The complexes are not able to undergo coordinative chain transfer polymerization with ethylene in the presence of alkylaluminium compounds as the corresponding dialkyl complexes do. Investigations of the reactions of the lanthanide aminopyridinato complexes with triethylaluminium or diisobutylaluminium hydride reveal a fast transfer of the aminopyridinato ligand to the aluminium atom. The products of this transfer reaction are aminopyridinato‐stabilized dialkylaluminium compounds. One example of these aluminium complexes was characterized by X‐ray crystal structure analysis. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)