Achieving multicolor photoluminescence, especially white-light emission, under mild conditions based on a single fluorescent compound is a great challenge. Herein, we report a novel colorful-emission host–guest complex BPCY, which is composed of a two-arm fluorescent guest molecule (BPC) and γ-cyclodextrin (γ-CD) as the host molecule. BPC bears a unique asymmetrical donor–acceptor–donor (D1-A+∼D2)-type structure, where D1, A+, and D2 stand for the binaphthol electron donor, pyridinium electron acceptor, and coumarin electron donor, respectively. The luminescence property of BPC shows dual-sensitivity, i.e., toward the excitation wavelength and the cyclodextrin host molecule. Under certain conditions, the complex shows three different emission wavelengths, allowing the realization of multicolor photoluminescence, including red (R), green (G), and blue (B) as well as various intermediate colors by orthogonally modulating these two stimuli. In this way, nearly pure white-light emission with CIE coordinates (...

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Multicolor Photoluminescence Including White-Light Emission by a Single Host-Guest Complex.

Stimuli–responsive metallopolymers

The synthesis of two cyan color (blue and green emission) displaying high molecular weight 2,6-bis(pyrazolyl)pyridine-co-octylated phenylethynyl conjugated polymers (CPs) is presented. The conjugated polymers are solution-processed to prepare spin coated thin films and self-assembled nano/microscale spheres, exhibiting cyan color under UV. Additionally, the metal coordinating ability of the 2,6-bis(pyrazolyl)pyridine available on the surface of the CP films and spheres is exploited to prepare red emitting Eu(III) metal ion containing conjugated polymer (MCCP) layer. The fabricated hybrid (CP/MCCP) films and spheres exhibit bright white-light under UV exposure. The Commission Internationale de l'Eclairage (CIE) coordinates are found to be (x = 0.33, y = 0.37) for hybrid films and (x = 0.30, y = 0.35) for hybrid spheres. These values are almost close to the designated CIE coordinates for ideal white-light color (x = 0.33, y = 0.33). This easy and efficient fabrication technique to generate white-color displaying films and nano/microspheres signify an important method in bottom-up nanotechnology of conjugated polymer based hybrid solid state assemblies.

White-Emitting Conjugated Polymer/Inorganic Hybrid Spheres: Phenylethynyl and 2,6-Bis(pyrazolyl)pyridine Copolymer Coordinated to Eu(tta)3

A simple and effective fluorescent chemosensor for the cascade recognition of Zn2+ and H2PO4− ions in protic media

A coumarin-based Schiff base (receptor 1) exhibited fluorescence enhancement selectively with Zn2+ at a nanomolar level in near-aqueous medium (EtOH–H2O; 1 : 1, v/v). The response was instantaneous with a detection limit of 3.26 × 10−9 M. The sensing event is supposed to incorporate a combinational effect of intramolecular charge transfer (ICT), chelation-enhanced fluorescence (CHEF) and CN isomerization mechanisms. Various spectroscopic methods, viz. IR, UV-visible, fluorescence and NMR in association with single crystal XRD studies, were used for thorough investigation of the structure of receptor 1 as well as of the sensing event. The Zn2+ complex of receptor 1 exhibited a very nice 1D chain coordination polymeric framework in its single crystal XRD.

A Zn2+-responsive highly sensitive fluorescent probe and 1D coordination polymer based on a coumarin platform

A novel fluorescence chemosensor 1 based on (R)-binaphthyl-salen can exhibit highly sensitive and selective recognition responses toward Cu2+ by "turn-off" fluorescence quench type in THF/H2O, and Zn2+ by "turn-on" fluorescence enhancement type in CHCl3/CH3CN, respectively, suggesting that solvents can dramatically affect the responsive properties of salen-based chemosensor. In addition, Cu2+ can lead to the most pronounced changes of CD spectra without the influence of solvents, which indicates this kind chemosensor can also be used as a sole Cu2+ probe based on CD spectra.

A Highly Sensitive and Selective Fluorescence Chemosensor for Cu2+ and Zn2+ Based on Solvent Effect

A novel polymer P-1 is prepared by the reaction of the monomer 5,5'-divinyl-2,2'-bipyridine and Salen-Zn(II) via Heck cross coupling. Interestingly, P-1 can further incorporate with Eu(TTA)(3)·2H(2)O to generate copolymer P-2 with two different metal centers. P-2 exhibits exceptional dual emissive properties which can be tuned by excitation wavelength. For example, an orange fluorescence can be obtained when P-2 is excited at 430 nm, whereas a red emission with a huge Stoke shift of 57 nm is observed when it is excited at 345 nm. The high wavelength emission can be attributed to Eu(III) ((5)D(0)→(7)F(2) ), which is lit by an effective photoinduced energy transfer process between P-1 and the Eu(TTA)(3) complex. The properties of P-2 have led to a better understanding of the energy transfer process between P-1 and Eu(TTA)(3) moieties.

Excitation induced emission color change based on Eu(III)-Zn(II)-containing polymer complex.

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A Highly Sensitive and Selective Fluorescence Chemosensor for Cu2+ and Zn2+ Based on Solvent Effect

Excitation induced emission color change based on Eu(III)-Zn(II)-containing polymer complex.