New bis-photochromic compounds based on diarylimidazoles: Synthesis and multistimuli-responsive optical properties.

Three new bis-photochromic molecules containing two 4,5-diarylimidazole units were synthesized and characterized. We investigated their photophysical properties and pH response characteristics in acetonitrile solutions and polymethylmethacrylate (PMMA) membranes. All compounds displayed significant pH responses for the imidazole ring in the molecular structure, which could be potentially used as pH probes.

The effects of extended π-conjugation in bipyridyl ligands on the tunable photophysics, triplet excited state and optical limiting properties of Pt(ii) naphthalimidyl acetylide complexes.

Pt(ii) complexes that exhibit long-lived triplet excited state lifetimes are promising for optical power limiting materials. The introduction of large π-conjugated substituents can switch the triplet excited state to a long-lived 3π,π* state. Herein, we report four Pt(ii) diimine complexes with high π-conjugation via inserting an aryl group on the diimine ligand.

Understanding the Effects of NaCl, NaBr and Their Mixtures on Silver Nanowire Nucleation and Growth in Terms of the Distribution of Electron Traps in Silver Halide Crystals.

In recent years, many research groups have synthesized ultra-thin silver nanowires (AgNWs) with diameters below 30 nm by employing Cl and Br simultaneously in the polyol process. However, the yield of AgNWs in this method was low, due to the production of Ag nanoparticles (AgNPs) as an unwanted byproduct, especially in the case of high Br concentration. Here, we investigated the roles of Cl and Br in the preparation of AgNWs and then synthesized high aspect ratio (up to 2100) AgNWs in high yield (>85% AgNWs) using a Cl and Br co-mediated method.

Synthesis, Luminescent Properties of aza-Boron-Diquinomethene Difluoride Complexes and Their Application for Fluorescent Security Inks.

Two aza-boron-diquinomethene (aza-BODIQU) complexes bearing phenyl and carbazyl substituents were synthesized and characterized. Their photophysical properties were investigated systematically via spectroscopic and theoretical methods. Both complexes exhibit strong (1)π-π* transition absorptions (λ(abs) = 400-540 nm) and intense fluorescent emissions (λ(em) = 440-600 nm, Φ(PL) = 0.

1,4-Di-bromo-2,5-di-p-toluoyl-benzene.

In the title compound, C22H16Br2O2, which has approximate non-crystallographic inversion symmetry, the dihedral angles between the central ring and the pendant rings are 89.1 (4) and 82.4 (3)°; the dihedral angle between the pendant rings is 12.

2-Bromo-1-mesitylethanone.

In the mol-ecule of the title compound, C(11)H(13)BrO, the adjacent C atoms are almost coplanar with the aromatic ring [maximum deviation 0.035 (3) Å]. In the crystal structure, weak inter-molecular C-H⋯O inter-actions link the mol-ecules into chains along the b axis.

9-Butyl-9H-carbazole.

The title compound, C(16)H(17)N, is a carbazole derivative that has been designed and synthesized as a potential organic electronic device, such as an OLED. The tricyclic aromatic ring system is essentially planar, the two outer rings making a dihedral angle of 4.8 (1)°.

2-(4-Methyl-benzo-yl)benzoic acid monohydrate.

In the title compound, C(15)H(12)O(3)·H(2)O, the two rings are oriented at a dihedral angle of 69.12 (3)°. In the crystal structure, intermolecular O-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional framework.

2,5-Dibromo-terephthalic acid dihydrate.

The asymmetric unit of the title compound, C(8)H(4)Br(2)O(4)·2H(2)O, contains one half-mol-ecule of 2,5-dibromo-terephthalic acid (DBTA) and one water mol-ecule. The DBTA mol-ecule is centrosymmetric. In the crystal structure, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules, forming a three-dimensional framework.