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Two novel alkaline earth coordination polymers constructed from cinnamic acid and 1,10‐phenanthroline: synthesis and structural and thermal properties
Author(s) -
Bendjellal Nassima,
Trifa Chahrazed,
Bouacida Sofiane,
Boudaren Chaouki,
Boudraa Mhamed,
Merazig Hocine
Publication year - 2018
Publication title -
acta crystallographica section c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 17
ISSN - 2053-2296
DOI - 10.1107/s2053229618001420
Subject(s) - phenanthroline , alkaline earth metal , cinnamic acid , coordination complex , chemistry , polymer , thermal , rare earth , inorganic chemistry , earth (classical element) , materials science , polymer chemistry , organic chemistry , alkali metal , mineralogy , metal , physics , thermodynamics , mathematical physics
In coordination chemistry and crystal engineering, many factors influence the construction of coordination polymers and the final frameworks depend greatly on the organic ligands used. The diverse coordination modes of N‐donor ligands have been employed to assemble metal–organic frameworks. Carboxylic acid ligands can deprotonate completely or partially when bonding to metal ions and can also act as donors or acceptors of hydrogen bonds; they are thus good candidates for the construction of supramolecular architectures. We synthesized under reflux or hydrothermal conditions two new alkaline earth(II) complexes, namely poly[(1,10‐phenanthroline‐κ 2 N , N ′)bis(μ‐3‐phenylprop‐2‐enoato‐κ 3 O , O ′: O )calcium(II)], [Ca(C 10 H 7 O 2 ) 2 (C 10 H 8 N 2 )] n , (1), and poly[(1,10‐phenanthroline‐κ 2 N , N ′)(μ 3 ‐3‐phenylprop‐2‐enoato‐κ 4 O : O , O ′: O ′)(μ‐3‐phenylprop‐2‐enoato‐κ 3 O , O ′: O )barium(II)], [Ba(C 10 H 7 O 2 ) 2 (C 10 H 8 N 2 )] n , (2), and characterized them by FT–IR and UV–Vis spectroscopies, thermogravimetric analysis (TGA) and single‐crystal X‐ray diffraction analysis, as well as by powder X‐ray diffraction (PXRD) analysis. Complex (1) features a chain topology of type 2,4 C4, where the Ca atoms are connected by O and N atoms, forming a distorted bicapped trigonal prismatic geometry. Complex (2) displays chains of topology type 2,3,5 C4, where the Ba atom is nine‐coordinated by seven O atoms of bridging/chelating carboxylate groups from two cinnamate ligands and by two N atoms from one phenanthroline ligand, forming a distorted tricapped prismatic arrangement. Weak C—H…O hydrogen bonds and π–π stacking interactions between phenanthroline ligands are responsible to the formation of a supramolecular three‐dimensional network. The thermal decompositions of (1) and (2) in the temperature range 297–1173 K revealed that they both decompose in three steps and transform to the corresponding metal oxide.