All chemicals were of the highest purity possible. All chemicals were used as received and no further purification was performed. 2-aminoethanol, Trimethylsilane chloride, 2- Chloroacetyle chloride, Cyclen, GdCl3 were purchased from Sigma-Aldrich. GraphPad Prism software was purchased from GraphPad Software, (San Diego, CA, USA).
Cyclen
Manufactured by Merck Group
Cyclen is a laboratory equipment product manufactured by Merck Group. It is a macrocyclic organic compound consisting of four nitrogen atoms and twelve carbon atoms arranged in a ring structure. Cyclen serves as a versatile chelating agent, capable of forming stable complexes with a wide range of metal ions.
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Lab products found in correlation
2 protocols using cyclen
1
Synthesis of Gadolinium-Based Contrast Agent
2
Infrared Spectroscopy of Protonated Cyclen
Check if the same lab product or an alternative is used in the 5 most similar protocols
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Infrared multiple-photon dissociation spectra were recorded on products isolated in a Fourier Transform Ion Cyclotron Resonance (FTICR) ion trap mass spectrometer. Protonated cyclen (nominal m/z = 173) was produced via electrospray ionization of 1 mM solutions of cyclen (Sigma-Aldrich, 97% purity) in 1 : 1 water/methanol, with added formic acid. The ions are pulse injected into the ICR cell, for isolation and subsequent irradiation with the infrared laser. Multiple-photon absorption at infrared wavelengths in resonance with the vibrational modes of the ion leads to fragmentation. The IRMPD spectrum was constructed by monitoring the total fragment yield as a function of the wavenumber of the radiation. 41 The yield was linearly corrected for the frequency-dependent IR laser pulse energy. Two laser sources were employed to irradiate the ions, namely an OPO/A laser system (optical parametric oscillator/amplifier, 90 pulses irradiation, 4-20 mJ per pulse, bandwidth 3 cm À1 ) for the range 2300-3600 cm À1 , and the free-electron laser FELIX (40 pulses irradiation, 20-70 mJ per pulse, bandwidth 0.5%) for the range 700-1900 cm À1 . 42 To compensate for the lower pulse energy of the OPO/A (as compared to FELIX) and increase the on-resonance dissociation yield, the ions were irradiated for 12 ms with the output of a 30 W continuous wave CO 2 laser directly after each OPO/A pulse. 43
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