Specific supramolecular interactions between Zn(2+)-salophen complexes and biologically relevant anions.
Recognition of inorganic phosphates PO(4)(3-), P(2)O(7)(4-), and P(3)O(10)(5-) and nucleotides AMP(2-), ADP(3-), and ATP(4-) by Zn(2+)-salophen complexes 1 and 2 in ethanol was investigated by different spectroscopic techniques. (31)P NMR and mass spectrometry showed that anions of both series are bound by 1 and 2, while absorption and emission studies revealed that only nucleotides produce relevant changes in the spectral properties of the two hosts. (1)H NMR studies proved that the adenine aromatic group is involved in the complexation, thus pointing out the role of supramolecular ditopic receptors played by salophen derivatives toward this class of biologically relevant substrates. The lifetime of the photogenerated triplet state of the Zn(2+)-salophen compounds was measured by nanosecond laser flash photolysis, and the observed changes upon increasing the concentration of nucleotides allowed the identification of the formation of a 1:0.5 host/guest intermediate complex additionally to the formation of a 1:1 complex.
Cano
Manoli
M
REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Monte de Caparica, Portugal.
Rodríguez
Laura
L
Lima
João Carlos
JC
Pina
Fernando
F
Dalla Cort
Antonella
A
Pasquini
Chiara
C
Schiaffino
Luca
L
D000227:Adenine Nucleotides / Q000737:chemistry*; D000838:Anions; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D012459:Salicylates / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet; D015032:Zinc / Q000737:chemistry*
D000227:Adenine Nucleotides; D000838:Anions; D012459:Salicylates; C090416:salophen; D015032:Zinc