Photophysical Properties of Linked Zinc Phthalocyanine to Acryloyl Chloride:N-vinylpyrrolidone Copolymer

This paper focuses on the linking of zinc phthalocyanine (ZnPc) to N-vinylpyrrolidone (N-VP): acryloyl chloride (ClAC) copolymer. The synthesis of binary N-VP:ClAC copolymer was performed by the radical polymerization method and then grafted to ZnPc by the Friedel Crafts acylation reaction. We have developed a water-soluble ZnPc:ClAC:N-VP photosensitizer with a narrow absorption band at 970 nm, fluorescence at λem = 825 nm and the decay fluorescence profile with 3-decay relatively longer times of 1.2 µs, 4.6 µs, and 37 µs. The concentration-dependent dark cytotoxicity investigated in normal fibroblasts (NHDF), malignant melanoma (MeWo), adenocarcinoma (HeLa), and hepatocellular carcinoma (HepG2) cell lines incubated to increased concentrations of ZnPc:ClAC:N-VP (up to 40 μM) for 24 h in the dark show low cytotoxicity. Maximum cell viability in HeLa and HepG2 tumor cell lines was observed.

Fluorescence emission originated from the H-aggregated cyanine dye with chiral gemini surfactant assemblies having a narrow absorption band and a remarkably large Stokes shift

A cyanine dye formed chiral H-aggregates with a narrow absorption band on gemini surfactant chiral assemblies and showed fluorescence emission with a remarkably large Stokes shift.

Colloidal indium sulfide quantum dots in water: synthesis and optical properties

ABSTRACTColloidal β-In2S3 quantum dots stabilized in water by a number of polymers or sodium polyphosphate and mercaptoacetate were synthesized. An increase in the stabilizer content was found to result in a decrease in the average dot size from 20–30 to 5–10 nm and formation of a narrow absorption band centered at 290 nm. The position and spectral width of the band were found to be independent on stabilizer concentration, synthesis temperature and molar In:S ratio. The band was assumed to belong to a molecular cluster smaller than 1 nm which is a precursor for formation of larger regular indium sulfide quantum dots.

Ruthenium-Komplexe mit Diazadienen, IX. Ein neuartiger Chromophor aus zwei Diazadien-Ruthenium-Einheiten — Struktur und Eigenschaften von [(CO)2(DAD)CH3Ru- RuCH3(DAD)(CO)2] (DAD = ipr—N=CH—CH=N —ipr) / Ruthenium Complexes with Diazadienes, IX. A New Chromophore from Two Diazadiene Ruthenium Units — Structure and Properties of [(CO)2(DAD)CH3Ru -RuCH3(DAD)(CO)2] (DAD = ipr-N = CH -CH = N -ip r)

The two-electron reduction of [(DAD)Ru(CO)2I2] (DAD = RN = CH -CH = NR ) gives the reactive ruthenates(O) [(DAD Ru(CO )2I]-, which add organic electrophiles to afford iodoruthenium organic com pounds such as [(DAD)Ru(CO)2(CH3)I] 3. Their electrochemical behaviour depends on the steric requirem ents of the D A D involved. With a small DAD (R = ipr) the oneelectron reduction gives a Ru(I) interm ediate, which finally yields a stable Ru-Ru-bonded dimer 4. With a bulky DAD(R - CH (ipr)2) the reduction proceeds to the organoruthenates [(DAD)Ru(CO)2R]-. The structure of the dimer 4 was determined by a single crystal X-rax diffraction study: C22H38N4O4Ru2 (624.69), space group F2dd, a = 9.944(2), b = 20.414(3), c = 27.644(5) Å , V = 5611,3(3) Å3, Z = 8; final R-value 0.034 from 2011 reflections. The molecule shows two almost planar (DAD )Ru(CO)2 units, which are staggered with respect to the Ru -Ru single bond. The methyl groups occupy the positions trans to this M-M bond. 4 represents a new type of chromophore with only one very intense and rather narrow absorption band near the infrared (λmax = 745 , ε = 30000 cm2 mmol-1), arising from the presence of a high-lying a-orbital, an antibonding combination of occupied d-orbitals and low-lying D A D π*-orbitals of proper symmetry.