Premium
Rubidium‐selektive Chromoionophore mit N ‐(Arylazoalkenoyl)azacoronand‐Struktur
Author(s) -
Kirschke Klaus,
Baumann Hendrik,
Costisella Burkhard,
Ramm Matthias
Publication year - 1994
Publication title -
liebigs annalen der chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 0170-2041
DOI - 10.1002/jlac.199419940905
Subject(s) - chemistry , rubidium , acetonitrile , medicinal chemistry , ring (chemistry) , potassium , organic chemistry
Rubidium‐Selective Chromoionophores with N ‐(Arylazoalkenoyl)azacoronand Structure The N ‐(arylazoalkenoyl)azacoronands 2a–2c have been synthesized by ring‐opening reaction of the dichloropyrazolin‐5(4 H )‐one 1 with the corresponding azacrowns. The structure of 2a was determined by X‐ray analysis. In the presence of Rb + salts the neutral solutions of 2a and 2b in acetonitrile or acetonitrile/water mixtures show a change of colour from yellow to red. Spectroscopic results of 1 H‐, 2 H‐, 13 C‐ and 87 Rb‐NMR investigations indicate a complexation of the Rb ion between the crown and the phenolic OH group of 2b .