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Updated: May 27, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
Published on: February 6, 2020
catena-Poly[[[bis-(4-ethyl-benzoato-κO,O')lead(II)]-μ-nicotinamide-κN:O] monohydrate]
Abstract:
In the crystal structure of the polymeric title compound, {[Pb(C(9)H(9)O(2))(2)(C(6)H(6)N(2)O)]·H(2)O}(n), the six-coordinate Pb(II) ion is chelated by two 4-ethyl-benzoate (PEB) anions and is bridged by two nicotinamide (NA) ligands, forming a polymeric chain running along the b axis. The carboxyl-ate groups of the PEB ions are twisted away from the attached benzene rings by 4.0 (6) and 13.3 (5)°. The two benzene rings of the PEB ions bonded to the same metal ion are oriented at a dihedral angle of 87.4 (3)°. In the polymeric chain, the NA ligand is linked to one of the carboxyl-ate groups via N-H⋯O hydrogen bonding. In the crystal, adjacent polymeric chains inter-act via N-H⋯O and weak C-H⋯O hydrogen bonds; and the lattice water mol-ecule links with the polymeric chains via N-H⋯O and O-H⋯O hydrogen bonding. π-π stacking between the benzene and the pyridine rings [centroid-centroid distance = 3.805 (5) Å] and weak C-H⋯π inter-actions are also observed in the crystal structure.
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Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.