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Cadmium(II) and Lead(II) Complexes with Novel Macrocyclic Receptors Derived from 1,10-Diaza-15-crown-5

✍ Scribed by David Esteban; Daniel Bañobre; Andrés de Blas; Teresa Rodríguez-Blas; Rufina Bastida; Alejandro Macías; Adolfo Rodríguez; David E. Fenton; Harry Adams; Jose Mahía

Book ID: 102676353
Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 586 KB
Volume: 2000
Category: Article
ISSN: 1434-1948
DOI: 10.1002/1099-0682(200007)2000:7<1445::aid-ejic1445>3.0.co;2-t

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✦ Synopsis

Two novel macrocycles, N,NЈ-bis(2-aminobenzyl)-1,10-diaza-15-crown-5 (L 1 ) and a non-symmetric cryptand incorporating a pyridinyl Schiff-base spacer (L 3 ), both derived from 1,10-diaza-15-crown-5, have been shown to act as receptors for lead(II) and cadmium(II) guests. The X-ray crystal structures reveal an anti conformation for the free ligand L 1 , but a syn arrangement in the lead(II) complex, [PbL 1 ](ClO 4 ) 2 . The corresponding cryptates of L 3 can be prepared by simple transmetallation reactions starting from the barium cryptate, showing the preference of L 3 for the heavy metal ions. The

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