Syntheses, X-ray structures, and properties of complexes of macrocyclic hexaimines with lanthanide nitrates
- 1 January 1987
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 7,p. 1665-1673
- https://doi.org/10.1039/dt9870001665
Abstract
Complexes [M (NO3)3L1]{M = La or Ce, L1= 2,7,13,18-tetramethyl-3,6,14,17,23,24-hexa-azatricyclo[17.3.1.18,12]tetracosa-1 (23),2,6,8,10,12(24),13,17,19,21-decaene}, [M(NO3)2L1(H2O)]NO3·H2O (M = La, Ce, or Pr), and [{M(NO3)L1(H2O)2}2]NO3[ClO4]3·4H2O (M = Nd, Sm, Eu, Gd, Tb, Dy, Ho, or Er) have been synthesised by a template condensation or by ligand exchange. The X-ray crystal structures of a member of each series, [La(NO3)3L1], [Ce(NO3)2L1(H2O)]NO3·H2O, and [{Nd(NO3)L1(H2O)2}2]NO3[ClO4]3·4H2O have been determined; the complexes contain the hexadentate macrocycle L1 co-ordinated to the lanthanide ion and are respectively 12-, 11-, and 10-co-ordinate. Properties including n.m.r. paramagnetic shifts are described.Keywords
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