Flash 2000 fisher scientific thermo electron analyzer

Dry THF and ether were obtained from a solvent purification system (LC Technology Solutions Incorporated). Nuclear magnetic resonance spectra were recorded on a Bruker Advance DRX 300 spectrometer operating at 300 MHz for 1 H and 75 MHz for 13 C. Chemical shifts are expressed in parts per million (ppm) downfield from external TMS. The following abbreviations are used: s, singlet; d, doublet; t, triplet; m, multiplet. MALDI-TOF MS spectra were recorded on a Bruker Biflex-IIITM apparatus, equipped with a 337nm N 2 laser.
Elemental analyses were recorded using Flash 2000 Fisher Scientific Thermo Electron analyzer. IR spectra were recorded on Bruker FT-IR Vertex 70 spectrometer equipped with a Platinum diamond ATR accessory. UV-Vis absorption spectra for 1 were recorded in solution using either a Lambda 19 or a Lambda 250 PERKIN ELMER spectrometer. Corresponding circular dichroism (CD) measurements were performed with a JASCO Corp. J-715 or J-810 apparatus. UV-Vis absorption spectra for 2 and 4 in CH 2 Cl 2 solution were recorded on a Cary 5000 spectrometer. Luminescence and excitation spectra in CH 2 Cl 2 solution were recorded on Fluorolog 3 fluorescence spectrophotometer. All luminescence spectra were corrected for the spectral response of the spectrometer and the detector as well as for the irradiation intensity.