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Killing two birds with one stone: 2D+2D→3D parallel stacking and 3D self‐penetrating structures in one reaction and their crystal‐to‐crystal transformation
Author(s) -
Mi Xiuna,
Sheng Dafei,
Wang Suna,
Lu Jing,
Yang Lu,
Zhou Zhen
Publication year - 2019
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/s2053229619005850
Subject(s) - carboxylate , nickel , ligand (biochemistry) , ethylene , chemistry , stacking , benzoic acid , crystallography , supramolecular chemistry , benzene , dimethylformamide , stereochemistry , medicinal chemistry , terephthalic acid , crystal structure , catalysis , solvent , organic chemistry , receptor , biochemistry , polyester
Reaction of the flexible phenolic carboxylate ligand 2‐(3,5‐dicarboxylbenzyloxy)benzoic acid (H 3 L ) with nickel salts in the presence of 1,2‐bis(pyridin‐4‐yl)ethylene (bpe) leads to the generation of a mixture of the two complexes under solvolthermal conditions, namely poly[[aqua[μ‐1,2‐bis(pyridin‐4‐yl)ethylene‐κ 2 N : N ′]{μ‐5‐[(2‐carboxyphenoxy)methyl]benzene‐1,3‐dicarboxylato‐κ 3 O 1 , O 1′ : O 3 }nickel(II)] dimethylformamide hemisolvate monohydrate], {[Ni(C 16 H 10 O 7 )(C 12 H 10 N 2 )(H 2 O)]·0.5C 3 H 7 NO·H 2 O} n or {[Ni(H L )(bpe)(H 2 O)]·0.5DMF·H 2 O} n , 1 , and poly[[diaquatris[μ‐1,2‐bis(pyridin‐4‐yl)ethylene‐κ 2 N : N ′]bis{μ‐5‐[(2‐carboxyphenoxy)methyl]benzene‐1,3‐dicarboxylato‐κ 2 O 1 : O 5 }nickel(II)] dimethylformamide disolvate hexahydrate], {[Ni 2 (C 16 H 10 O 7 ) 2 (C 12 H 10 N 2 ) 3 (H 2 O) 2 ]·2C 3 H 7 NO·6H 2 O} n or {[Ni 2 (H L ) 2 (bpe) 3 (H 2 O) 2 ]·2DMF·6H 2 O} n , 2 . In complex 1 , the Ni II centres are connected by the carboxylate and bpe ligands to form two‐dimensional (2D) 4‐connected (4,4) layers, which are extended into a 2D+2D→3D (3D is three‐dimensional) supramolecular framework. In complex 2 , bpe ligands connect to Ni II centres to form 2D layers with Ni 6 (bpe) 6 metallmacrocycles. Interestingly, 2D+2D→3D inclined polycatenation was observed between these layers. The final 5‐connected 3D self‐penetrating structure was generated through further connection of Ni–carboxylate chains with these inclined motifs. Both complexes were fully characterized by single‐crystal analysis, powder X‐ray diffraction analysis, FT–IR spectra, elemental analyses, thermal analysis and UV–Vis spectra. Notably, an interesting metal/ligand‐induced crystal‐to‐crystal transformation was observed between the two complexes.