Shengqiang Xiao

Self-Assembly and Characterization of A Novel Hydrogen-Bonded Nanostructure

A novel hydrogen-bonded supramolecular system of a [60]fullerene derivative with perylene bisimide was synthesized and characterized. 1H NMR spectra confirmed the existence of strong hydrogen-bonding interaction between compounds 1 and 5. Transmission electron microscopy images of 1.5 aggregates showed spherical particles having a mean diameter of 50 nm. The photocurrent response of the film was measured, and a steady and rapid anodic photocurrent response was obtained.

Synthesis and Photovoltaic Properties of Novel Monoadducts and Bisadducts Based on Amide Methanofullerene

Four new [6,6]-phenyl-C(61) and C(71) butylsaure n-dibutyl amides (PCBDBA) with mono- and bis-adduction on C(60) and C(70) cages, respectively, have been synthesized as models to study the effect of the mono- and bis-adduction on fullerene cages on device performance when used as electron acceptors with the donor of regioregular P3HT in bulkheterojunction organic photovoltaics (BHJ-OPV). The optoelectronic, electrochemistry, and photovoltaic properties of these mono- and bis-products were fully investigated. The best device performance of these fullerene derivatives were obtained from the two monoadducts with power conversion efficiency (PCE) of 1.77% for C(60) derivative and 1.90% for C(70) derivative, respectively, which are close to PCBMs 2.43%. The results revealed the structure-function relationship among the monoadduct and bisadduct derivatives of C(60) and C(70) with the BHJ-OPV performance.

A method for controlling the synthesis of stable twisted two-dimensional conjugated molecules

Thermodynamic stabilization (π-electron delocalization through effective conjugation) and kinetic stabilization (blocking the most-reactive sites) are important considerations when designing stable polycyclic aromatic hydrocarbons displaying tunable optoelectronic properties. Here, we demonstrate an efficient method for preparing a series of stable two-dimensional (2D) twisted dibenzoterrylene-acenes. We investigated their electronic structures and geometries in the ground state through various experiments assisted by calculations using density functional theory. We find that the length of the acene has a clear effect on the photophysical, electrochemical, and magnetic properties. These molecules exhibit tunable ground-state structures, in which a stable open-shell quintet tetraradical can be transferred to triplet diradicals. Such compounds are promising candidates for use in nonlinear optics, field effect transistors and organic spintronics; furthermore, they may enable broader applications of 2D small organic molecules in high-performance electronic and optical devices.

Self-assembly of a derivated PPV and a functionnalized fullerene by hydrogen bonding

A new self-assembly system of derivated PPV with organofullerene by a three-point hydrogen- bonding interaction was synthesized. The formation of hydrogen bonding was confirmed by 1 H-NMR and fluorescence quenching experiments.

Synthesis and characterization of a novel water-soluble cationic poly (phenylene vinylene)

A novel water-soluble, cationic PPV derivatives poly {(2,5-bis(3-bromotrimethylammonio propoxy)-phenylene-1,4-divinylene)-alt-1,4-(2,5-bis(2-(2-hydroxyethoxy)ethoxy))phenylene vinylene} (BH-PPV) has been synthesized through a Heck coupling reaction.

Synthesis and characterization of two [5,6]-open and [6,6]-closed [60]fullerene isomers

Two novel [5,6]-open and [6,6]-closed fullerene isomers and a ketolactam fullerene derivative bearing 2,6-bis (acylamino) pyridine unit as hydrogen bonding motif were synthesized through the cycloaddition reaction of alkyl azide to [60] fullerene. 1 H NMR, 13 C NMR. MALD1-TOF and FT-IR confirmed their structures.

Synthesis and Characterization of a C60 Covalently Linked Poly(phenylenevinylene) Derivative Containing Trimethylsilyl Pendant

Copolymer poly {p-phenylenevinylene-alt-2, 5-bis (trimethylsilyl)-p-phenylenevinylene-3, 6-[9-(1-azafulleroid-propyl) carbazolenevinylene]} (TMSi-PPV-C 60 ) were synthesized and characterized by means of 1 H NMR, FT-IR, UV-Vis and FL spectra, as well as GPC, TGA and cyclic voltammetry techniques.

Simple synthesis of CdS nanorods by sulfur powders

CdS nanowires are obtained using sulfur powders and organic diamines without any catalysts, surfactants, and templates under atmospherie benchtop conditions. The TEM images show that the length of CdS nanowires is0.37-2.4 μm, the diameter of the nanowires is 50-260 nm.

Self-assembled lead nanowires with [60] fullerene-substituted oligopyridines

The lead nanowires have been prepared by self-assembly using [60]fullerene derivatives containing oligopyridyl group as stabilizer. The TEM images show that the length of lead nanowires are in the range of 0.1∼0.7μm, the diameter of the nanowires are in the range of 30∼50 nm.

Self‐assembly and Optical Limiting Properties of Au Nanoparticles

The cycloaddition reaction of azide of oligopyridine with [60]fullerene was used to synthesize two novel [60]fullerene derivatives containing bi/tri‐pyridyl group, which were employed to self‐assemble on the surface of gold nanoparticles. Optical limiting of the gold nanoparticles in chloroform were determined