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1 H and 13 C NMR study of paramagnetic chiral macrocyclic lanthanide complexes
Author(s) -
Lisowski Jerzy
Publication year - 1999
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199904)37:4<287::aid-mrc455>3.0.co;2-#
Subject(s) - chemistry , lanthanide , paramagnetism , organic chemistry , ion , physics , quantum mechanics
The chiral macrocyclic complexes obtained in a templatecondensation of ( R , R )‐1,2‐diaminocyclohexane and2,6‐diformylpyridine, [LnL](NO 3 ) 3 , Ln=La(III),Ce(III), Eu(III) and Yb(III), werestudied by 1 Hand 13 C NMR spectroscopy. Thesignal assignment was based on COSY, NOESY and HMQC measurements andthe isotropic shifts of the paramagnetic complexes were analysed. Thespectra of the investigated compounds in methanol–chloroformsolution indicate a D 2 ‐symmetrical, helicalconformation of the ligand. The chiral [LnL](NO 3 ) 3 complexes are able to form diastereoisomericadducts with D ‐ and L ‐aminoacids thatcan be distinguished by 1 H NMR spectroscopy. Copyright© 1999 John Wiley & Sons, Ltd.