Generation-Independent Dimerization Behavior of Quadruple Hydrogen-Bond-Containing Oligoether Dendrons (original) (raw)
spectra for structural characterization were recorded on a Bruker Avance DPX300 (1 H: 300 MHz; 13 C: 75.5 MHz) or DRX500 (1 H: 500 MHz) spectrometer. 1 H NMR spectra for dimerization studies were recorded on a Bruker Avance 600 (1 H: 600 MHz) or DRX500 (1 H: 500 MHz) spectrometer. Unless otherwise stated, all NMR measurements were carried out in CDCl 3 at 25 °C. Chemical shifts were reported as parts per million (ppm) in δ scale using solvent residual peak (1 H: δ = 7.26; 13 C: δ = 77.16) as internal standard. Coupling constants (J) were reported in hertz. Mass spectra were obtained on a ThermoFinnigan MAT 95 XL double focusing sector mass spectrometer with electron impact (EI), fast atom bombardment (FAB), or electron spray ionization (ESI) technique. Vapor pressure osmometric (VPO) measurements were performed on a Knauer vapor pressure osmometer K-7000 at 30 °C using CHCl 3 as solvent. FT-IR spectra were obtained on a Shimadzu FTIR-8400S spectrophotometer with NaCl plate. Gel permeation chromatographic (GPC) measurements were performed on Waters ® Styragel columns (HR1, HR2, HR3, and HR4 7.8 × 300 mm in serial) at 40 °C using THF as eluent (flow rate = 1.0 mL/min) on a Water ® HPLC 515 pump equipped with a Waters ® 486 tunable UV absorbance detector. Melting points were measured on an Electrothermal ® 9100 digital melting point apparatus and were uncorrected. Elemental analyses were carried out at MEDAC Ltd.,
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