Adenosine monophosphate recognition by zinc-salophen complexes: IRMPD spectroscopy and quantum modeling study
Abstract
Zn-salophen complexes are a promising class of fluorescent chemosensors for nucleotides and nucleic acids. We have investigated, by means of IRMPD spectroscopy experiments and quantum chemical calculations, the structure of the host-guest complexes formed by two efficient Zn-salophen receptors and dihydrogen phosphate or adenosine 5‧-monophosphate (AMP) anions. In the host-guest complexes the phosphate group is bound with a Znsbnd O(phosphate) bond. In addition, a hydrogen bond can be formed between the POsbnd H group and one of the oxygen atoms of the salophen structure. The complexes with AMP anions are endowed with a hydrogen bonded coordination motif together with a weaker π⋯π interaction. It is thus confirmed that the marked changes of the spectroscopic emission properties of Zn-salophen when complexed with AMP can be associated with the existence of π⋯π stacking interactions between the salophen aromatic rings and those of the adenosine nucleobase.
- Publication:
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Journal of Molecular Spectroscopy
- Pub Date:
- May 2017
- DOI:
- 10.1016/j.jms.2017.02.014
- Bibcode:
- 2017JMoSp.335..108C