2008/06/30 by M. Vogel, Michael Vogel · 1 citation
Biochemistry, Genetics and Molecular Biology · Chemistry · Materials Science · Physics and Astronomy · #Chemical physics #Chemistry #Condensed matter physics #Crystallography #Diffusion #Hydrogen bond #Material Dynamics and Properties #Materials science #Molecule #NMR spectroscopy and applications #Physics #Protein Structure and Dynamics #Quantum mechanics #Tetrahedron #Thermodynamics #cond-mat.soft
paper · pdf · doi:10.1103/physrevlett.101.225701
4 pages, 3 figures
arxiv created 2008/10/22 · openalex publication_date 2008/11/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
2H NMR is used to study the mechanisms for the reorientation of protein hydration water. In the past, crossovers in temperature-dependent correlation times were reported at Tx1\ensuremath≈225 K (X1) and Tx2\ensuremath≈200 K (X2). We show that neither X1 nor X2 are related to a fragile-to-strong transition. Our results rule out an existence of X1. Also, they indicate that water performs thermally activated and distorted tetrahedral jumps at T<Tx2, implying that X2 originates in an onset of this motion, which may be related to a universal defect diffusion in materials with defined hydrogen-bond networks.