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. 2022 Jul 5;13:3660. doi: 10.1038/s41467-022-31164-z

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Fig. 3 — a Powder X-ray diffraction patterns of the crystal sample at different steps. I: initial state (blue line: dinuclear structure); II: addition of pyridine (py) vapor (red line: conversion to [Tb(tmh)₃(py)₂] with uncoordinated 4,4’-bpy); III: elimination of py under vacuum (green line: transformation to coordination polymer). The third step includes the by-product [Tb(tmh)₃(py)₁]⁵⁶. b Illustration of the transformation. c Proposed structural transformation with py insertion. One Tb(tmh)₃ center of the dinuclear structure and hydrogen atoms are omitted for clarity. Gray spheres represent carbon; red spheres, oxygen; blue spheres, nitrogen and green spheres, terbium. Py molecules are highlighted in green. Tb, terbium; tmh, 2,2,6,6-tetramethyl-3,5-heptanedionato; 4,4′-bpy, 4,4′-bipyridine; py, pyridine.