A benzyl alcohol derivative of the BDPA radical for fast dissolution dynamic nuclear polarization NMR spectroscopy.

Optimized Polarization Build-Up Times in Dissolution DNP-NMR Using a Benzyl Amino Derivative of BDPA

Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain. b Servei de Ressonància Magnètica Nuclear, Facultat de Ciències i Biociències, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Catalonia, Spain. ‡ These authors have contributed equally. †Electronic Supplementary Information (ESI) available: [Synthesis and characterization of free radicals 1-7, EPR spe...

BDPA: an efficient polarizing agent for fast dissolution dynamic nuclear polarization NMR spectroscopy.

Water-soluble narrow-line radicals for dynamic nuclear polarization.

The synthesis of air-stable, highly water-soluble organic radicals containing a 1,3-bis(diphenylene)-2-phenylallyl (BDPA) core is reported. A sulfonated derivative, SA-BDPA, retains the narrow electron paramagnetic resonance linewidth (<30 MHz at 5 T) of the parent BDPA in highly concentrated glycerol/water solutions (40 mM), which enables its use as polarizing agent for solid effect dynamic nu...

The efficiency of DPPH as a polarising agent for DNP-NMR spectroscopy.

The free radical 2,2-diphenyl-1-pycrylhydrazyl (DPPH) was tested as a polarising agent for fast dissolution dynamic nuclear polarisation (DNP) NMR spectroscopy. DPPH was found to be reasonably soluble in sulfolane and the optimum concentration for DNP is 20-40 mM depending upon whether short polarisation times or the maximum signal intensity is needed. W-band ESR measurements revealed that the ...

Observation of strongly forbidden solid effect dynamic nuclear polarization transitions via electron-electron double resonance detected NMR.

We present electron paramagnetic resonance experiments for which solid effect dynamic nuclear polarization transitions were observed indirectly via polarization loss on the electron. This use of indirect observation allows characterization of the dynamic nuclear polarization (DNP) process close to the electron. Frequency profiles of the electron-detected solid effect obtained using trityl radic...