title: Hierarchical self-assembly of squaraine and silica nanoparticle functionalized with cationic coordination sites for near infrared detection of ATP.
abstract: Optical activity of hierarchical supramolecular assemblies based on organic dyes would create multiple functional architectures. In this work, three kinds of silica nanoparticles with or without functional groups were synthesized. For the first time, silica nanoparticles can induce positively charged squaraine (SQ) to aggregate to form supramolecular assemblies. Adenosine-5'-triphosphate (ATP) as building blocks was absorbed on the surface of silica nanoparticles through metal-anion coordination and electrostatic interactions, in which the aggregates of SQ was transferred to monomer. The thickness being composed of ATP and SQ on the outside of nanoparticles is about 5 nm. These supramolecular assemblies showed selective turn-on fluorescence response to ATP in near infrared (NIR) region over other ions through metal-anion coordination and electrostatic interactions. These functional silica nanoparticles possessing many advantages provide proof-of-principle "seed crystals" for construction of supramolecular assemblies and platforms for sensing with facile performance.
authors.affiliation: Shaanxi Key Laboratory of Natural Products &Chemical Biology, College of Chemistry &Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
authors.forename: Ruizhi
authors.initials: R
authors.lastname: Feng
authors.affiliation: Shaanxi Key Laboratory of Natural Products &Chemical Biology, College of Chemistry &Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
authors.forename: Weining
authors.initials: W
authors.lastname: Shi
authors.affiliation: Shaanxi Key Laboratory of Natural Products &Chemical Biology, College of Chemistry &Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
authors.forename: Dejia
authors.initials: D
authors.lastname: Wang
authors.affiliation: Shaanxi Key Laboratory of Natural Products &Chemical Biology, College of Chemistry &Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
authors.forename: Jia
authors.initials: J
authors.lastname: Wen
authors.affiliation: Shaanxi Key Laboratory of Natural Products &Chemical Biology, College of Chemistry &Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
authors.forename: Hongjuan
authors.initials: H
authors.lastname: Li
authors.affiliation: Shaanxi Key Laboratory of Natural Products &Chemical Biology, College of Chemistry &Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
authors.forename: Shiguo
authors.initials: S
authors.lastname: Sun
authors.affiliation: Shaanxi Key Laboratory of Natural Products &Chemical Biology, College of Chemistry &Pharmacy, Northwest A&F University, Yangling, Shaanxi, 712100, P. R. China.
authors.forename: Yongqian
authors.initials: Y
authors.lastname: Xu
mesh_terms: D000255:Adenosine Triphosphate / Q000737:chemistry; D015374:Biosensing Techniques; D002412:Cations / Q000737:chemistry; D003503:Cyclobutanes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007259:Infrared Rays; D007477:Ions; D018613:Microscopy, Confocal; D057054:Molecular Imaging; D053758:Nanoparticles / Q000737:chemistry / Q000648:ultrastructure; D010636:Phenols / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D012996:Solutions
chemical_list: D002412:Cations; D003503:Cyclobutanes; D007477:Ions; D010636:Phenols; D012996:Solutions; C480596:squaraine; D012822:Silicon Dioxide; D000255:Adenosine Triphosphate