Incommensurate Phase in Λ-cobalt (III) Sepulchrate Trinitrate Governed by Highly Competitive N-H⋅⋅⋅O and C-H⋅⋅⋅O Hydrogen Bond Networks.

ABSTRACT: Phase transitions in molecular crystals are often determined by intermolecular interactions. The cage complex of [Co(C₁₂ H₃₀ N₈ )]³⁺  ⋅ 3 NO₃ ^- is reported to undergo a disorder-order phase transition at T_c1 ≈133 K upon cooling. Temperature-dependent neutron and synchrotron diffraction experiments revealed satellite reflections in addition to main reflections in the diffraction patterns below T_c1 . The modulation wave vector varies as function of temperature and locks in at T_c3 ≈98 K. Here, we demonstrate that the crystal symmetry lowers from hexagonal to monoclinic in the incommensurately modulated phases in T_c1 c3 . Distinctive levels of competitions: trade-off bet

SUBMITTER: Dey S 

PROVIDER: S-EPMC9303887 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature