Robust parahydrogen-induced polarization at high concentrations.

Area of Science:

• Nuclear Magnetic Resonance Spectroscopy
• Quantum Chemistry

Background:

• Parahydrogen-induced polarization (PHIP) is a powerful method for hyperpolarizing target molecules.
• PHIP relies on converting parahydrogen singlet spin order into target nucleus magnetization via magnetic fields.
• Current PHIP methods face reduced efficiency at high molar polarization due to interfering magnetic fields.

Purpose of the Study:

• To develop a method for efficient singlet-to-magnetization polarization transfer in PHIP.
• To overcome the limitations of high molar polarization in PHIP scalability.
• To enable PHIP applications without concentration restrictions.

Main Methods:

• A novel pulse sequence was designed to suppress the distant dipolar field.
• The pulse sequence facilitates simultaneous singlet-to-magnetization polarization transfer.
• The method was tested under conditions of high molar polarization.

Main Results:

• The developed pulse sequence effectively suppresses the influence of the distant dipolar field.
• Efficient singlet-to-magnetization polarization transfer was achieved, independent of molar polarization.
• The technique overcomes previous restrictions on concentration, enhancing PHIP scalability.

Conclusions:

• A new PHIP pulse sequence enables efficient polarization transfer irrespective of molar polarization.
• This advancement removes critical scalability limitations for PHIP applications.
• The method broadens the applicability of hyperpolarized molecules in various scientific fields.