Abstract
Nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) are essential tools in natural and life sciences, but their low sensitivity often hampers their applicability. Photochemically induced dynamic nuclear polarization (photo-CIDNP) offers a versatile and mild method to overcome this limitation. Here, we report on structure-photo-CIDNP relationship studies in liquid-state NMR utilizing a holistic approach. We synthesized biomimetic tryptophan-flavin diads with varying linker lengths composed of conformationally rigid oligoproline units. The predominant polyproline II (PPII) helical structure ensures consistent donor-acceptor distances. Photo-CIDNP experiments revealed significant hyperpolarization effects, particularly in diads with six proline units, mimicking the spatial arrangement found in natural photoactive proteins. Our findings highlight the potential of these biomimetic diads to enhance nuclear hyperpolarization in NMR spectroscopy. This work provides valuable insights into the design of diads for efficient photo-CIDNP generation, paving the way for advanced studies in modern NMR and bio-MRI.
Supplementary materials
Title
Supporting Information
Description
General Procedures, Spectral and Computational Data, Compound Characterization
Actions
Title
Video 1
Description
MD simulation
Actions
Title
Video 2
Description
diad 2a
Actions
Title
Video 4
Description
diad 2c
Actions
Title
Video 4
Description
diad 3c
Actions
Title
Video 3d
Description
diad 3d
Actions
Title
parameters diads
Description
parameters diads for simulation
Actions
Title
PSF
Description
diad 3a
Actions
Title
PDB
Description
diad 3a
Actions