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. 2016 May 11;7:11564. doi: 10.1038/ncomms11564

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(a) Evolutions of temperature-dependent unit-cell parameters; all parameters are normalized by those determined at 123 K; the unit cell of compound 1t has been transferred to that of compound 1o for direct comparison (that is, , , c_o=c_t, V_o′=2 × V_t,); evolution of temperature-dependent (b) angle ϕ, (c) angles θ and η, and (d) angles δ and κ. During the phase transition, angles η and κ undergo a dramatic change, implying that the pyridyl rings in BPE along the b axis flip drastically.

Inline graphic — (a) Evolutions of temperature-dependent unit-cell parameters; all parameters are normalized by those determined at 123 K; the unit cell of compound 1t has been transferred to that of compound 1o for direct comparison (that is, , , c_o=c_t, V_o′=2 × V_t,); evolution of temperature-dependent (b) angle ϕ, (c) angles θ and η, and (d) angles δ and κ. During the phase transition, angles η and κ undergo a dramatic change, implying that the pyridyl rings in BPE along the b axis flip drastically.