Homochiral crystallization of single-stranded helical coordination polymers: generated by the structure of auxiliary ligands or spontaneous symmetry breaking

Symmetry Breaking in Self-Assembled Nanoassemblies

“…Therefore, the eventual macroscopic chirality is observed [17]. Besides the hydrogen bond, there are a number of examples of dative-bond (coordination bond) driven symmetry breaking [82][83][84][85][86]. Figure 2B shows a novel coordination polymer gelators that stemmed from the coordination of Ag(I) and the achiral imidazole derivative [17].…”

Evaluation of the Antioxidant Activity of Copper(II) Complexes containing Tris‐(hydroxymethyl)aminomethane (TRIS) Units

“…The deprotonated alcohol oxygen atoms perform a μ‐type bond between two central metal atoms, thus O3–Cu1 [1.943(2) Å] and O3–Cu2 [1.954(2) Å], O6–Cu2 [1.947(2) Å] and O6–Cu3 [1.907(2) Å], O9–Cu3 [1.960(2) Å] and O9–Cu4 [1.941(2) Å], O12–Cu1 [1.936(2) Å], and O12–Cu4 [1.950(2) Å]. The values are related to those found in the literature Cu–N(imine), , , , and Cu–O(deprotonated alcohol) . Other relevant angles and bond length values obtained by the structural analysis of complex 2 are listed in Table S2 (Supporting Information).…”

Chiral or achiral: four isomeric Cd(ii) coordination polymers based on phenylenediacrylate ligands

“…Products with an enantiomeric bias may occasionally be obtained because of statistical fluctuation of initial nucleation events, 29 and it may be possible to control the handedness through seeding. [42][43][44][45][46][47][48][49] Compared with benzenedicarboxylic acids, which have been widely used for the construction of coordination polymers, phenylenediacrylic acids (Scheme 1) have two additional CC bonds, which maintain the rigidity through the extended conjugation and meanwhile generate new features such as much expanded space between carboxylate groups and reduced steric hindrance around individual carboxylate groups. The process is unpredictable, but the probability of occurrence can be increased by, for example, choosing some ligands that tend to connect metal ions in twisted conformations to give chiral motifs.…”

“…40,41 V-shaped organic bridging ligands with flexible tethers or coordinative groups (e.g., carboxylates) may lead to helical chain motifs, which can spontaneously resolve into 3D chiral structures provided that there are interchain homochiral interactions (coordination, hydrogen bonding and/or π-π stacking). [42][43][44][45][46][47][48][49] Compared with benzenedicarboxylic acids, which have been widely used for the construction of coordination polymers, phenylenediacrylic acids (Scheme 1) have two additional CC bonds, which maintain the rigidity through the extended conjugation and meanwhile generate new features such as much expanded space between carboxylate groups and reduced steric hindrance around individual carboxylate groups. Among the isomers, p-phenylenediacrylic acid (H 2 ppda) has been used to construct a number of coordination polymers, [50][51][52][53][54][55][56][57][58] but the study of coordination polymers with m-phenylenediacrylic acid (H 2 mpda) is still very limited.…”