Novel carbazole–pyridine copolymers by an economical method: synthesis, spectroscopic and thermochemical studies

• Aamer Saeed,
• Madiha Irfan and
• Shahid Ameen Samra

Beilstein J. Org. Chem. 2011, 7, 638–647, doi:10.3762/bjoc.7.75

• of P2a in THF at room temperature. Thermochemical properties of the polymers The thermal properties of the two series of polymers, P1 and P2 were investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). For TGA the samples were heated (PerkinElmer Thermal Analysis

• System 409) from 25 °C to 85 °C at a rate of 10 °C/min and at a nitrogen gas flow rate of 80 mL/min. Polymers P1 and P2 lost weight gradually during the early phase of the experiment. A thermal gravimetric analysis curve of P1a is shown in Figure 3. The thermal analysis results indicated that polymers P1

• and P2 have a high decomposition temperature Td and good thermal stability above 300 °C, which is very attractive for the fabrication of stable organic electroluminescent devices. TGA thermograms for polymers P1 and P2 are shown in Figure 4 and the results of the thermal analysis are shown in Table 1

Synthesis, spectral characterization, electron microscopic study and thermogravimetric analysis of a phosphorus containing dendrimer with diphenylsilanediol as core unit

• E. Dadapeer,
• B. Hari Babu,
• C. Suresh Reddy and
• Naga Raju Charmarthi

Beilstein J. Org. Chem. 2010, 6, 726–731, doi:10.3762/bjoc.6.85

• molecule was studied by scanning electron microscopy (SEM), whilst the molecular decomposition of the dendrimer G6 was investigated by both thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Scanning electronic microscopic study In order to get a deeper insight into the properties of

• surface. TGA-DTA analysis Thermogravimetric analysis (thermal gravimetric analysis (TGA)) was carried out on G6 to determine weight changes with respect to changes in temperature. Similarly, differential thermal analysis (DTA), was performed on G6 to establish whether the changes were either exothermic or

Poly(glycolide) multi-arm star polymers: Improved solubility via limited arm length

• Florian K. Wolf,
• Anna M. Fischer and
• Holger Frey

Beilstein J. Org. Chem. 2010, 6, No. 67, doi:10.3762/bjoc.6.67

• Perkin-Elmer 7 Series Thermal Analysis System with auto sampler in the temperature range from −40 to 230 °C at a heating rate of 20 K/min. The melting points of indium (Tm = 156.6 °C) and Millipore water (Tm = 0 °C) were used for calibration. Reagents Diglyme (99%) and glycidol (Sigma Aldrich) were

Ring-alkyl connecting group effect on mesogenic properties of p-carborane derivatives and their hydrocarbon analogues

• Aleksandra Jankowiak,
• Piotr Kaszynski,
• William R. Tilford,
• Kiminori Ohta,
• Adam Januszko,
• Takashi Nagamine and
• Yasuyuki Endo

Beilstein J. Org. Chem. 2009, 5, No. 83, doi:10.3762/bjoc.5.83

• structurally similar mesogens containing the four ring systems A–D. Experimental Optical microscopy and phase identification were performed using a PZO “Biolar” polarized microscope equipped with a HCS400 Instec hot stage. Thermal analysis was obtained using a TA Instruments 2920 DSC. Transition temperatures

Pd/C- Mediated synthesis of indoles in water

• Mohosin Layek,
• Udaya Lakshmi,
• Dipak Kalita,
• Deepak K. Barange,
• Aminul Islam,
• K. Mukkanti and
• Manojit Pal

Beilstein J. Org. Chem. 2009, 5, No. 46, doi:10.3762/bjoc.5.46

• ) are given in hertz. Infrared spectra were recorded on a FTIR spectrometer. Melting points were determined by using thermal analysis and differential scanning calorimetry (DSC) was generated with the help of DSC-60A dector. MS spectra were obtained on a mass spectrometer. Chromatographic (HPLC) purity