8453 diode array uv vis spectrometer

The FTIR spectra of solid samples of the Mq3 complexes studied and of the free ligands were recorded at T = 298.1 K using a FTIR Spectrum BX equipped with an ATR Pike Tech-nologies GladiaATR™ sample holder. The UV-Vis spectra of all Mq3 complexes and of the free ligands in CH2Cl2, at T = 298.1 K, were recorded with an Agilent 8453 diode array UV-Vis spectrometer, using a quartz cell with a path length of 10.00 mm. Temperature control was achieved by means of a Julabo F25 HP refrigerated circulator.
The concentration of the samples was in the order of 10 -5 M.

The acetonitrile solvent was of HPLC grade and purchased from Merck. Mg(ClO 4 ) 2 was from Sigma Aldrich, and used without further purification.
The absorption spectra were recorded on an Agilent 8453 diode array UV-Vis spectrometer. The fluorescence spectra and the fluorescence decay curves were recorded with an FLS920 Edinburgh Instruments combined steady state and fluorescence lifetime spectrometer. Two pulsed diode lasersan EPL-375 (emitting at 378 nm, pulse width ∼90 ps) and an EPL-470 (emitting at 473 nm, pulse width ∼100 ps) were used as light sources when the decay curves were recorded. NMR spectra were recorded on a Bruker Avance DRX-500 spectrometer. The mass spectra were obtained using a Waters Q-TOF Premier mass spectrometer (Manchester, UK) in positive electrospray mode.
In the photolysis experiments, the samples were irradiated by using an Osram XBO OFR 150 W xenon arc lamp, placing a BG3/4g band-pass filter in front of the lamp, with a transmission range of ∼300-420 nm. The photon flux incident on the samples was determined by chemical actinometry, via measuring the yield of photoconversion of o-nitrobenzaldehyde into o-nitrosobenzoic acid. 32, 33 The optical spectroscopic and photochemical experiments were carried out at 25 °C, in aerated solutions.