Zn(ii) and Co(ii) coordination polymers based on semi-rigid bis-pyridyl-bis-amide and angular dicarboxylate ligands: synthesis, structures and properties. Issue 34 (17th August 2022)

• Record Type: Journal Article
• Authors: Lakshmanan, Venkatesan; Lee, Chia-Yi; Tseng, Yu-Wen; Liu, Yu-Hsiang; Lin, Chia-Her; Chen, Jhy-Der
• Is Part Of: CrystEngComm. Volume 24:Issue 34(2022)
• Page Start: 6076
• Page End: 6086
• Publication Date: 2022-08-17
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d2ce00826b
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Hydro(solvo)thermal reactions of N, N′ -di(3-methylpyridyl)oxalamide (L 1 ) and N, N′ -di(4-methylpyridyl)oxalamide (L 2 ) with angular dicarboxylic acids and metal salts afforded six new coordination polymers showing interesting properties. Abstract : Hydro(solvo)thermal reactions of N, N ′-di(3-methylpyridyl)oxalamide (L 1 ) and N, N ′-di(4-methylpyridyl)oxalamide (L 2 ) with angular dicarboxylic acids and Zn(ii ) and Co(ii ) metal salts afforded six coordination polymers (CPs), namely, [Zn(L 1 )0.5 (FIPBB)·H2 O] n [H2 FIPBB = 4, 4′-hexafluoroisopropylidenebis(benzoic acid)] (1 ), [Zn(L 2 )(OBA)·CH3 OH] n [H2 OBA = 4, 4′-oxybis(benzoic acid)] (2 ), [Co(L 2 )0.5 (FIPBB)·0.25CH3 OH] n (3 ), [Co(L 1 )(OBA)·2H2 O] n (4 ), [Co(L 1 )0.5 (FIPBB)] n (5 ), and [Co2 (L 1 )2 (FIPBB)2 (H2 O)5 ·4H2 O] n (6 ), which have been structurally characterized by using single-crystal X-ray diffraction. CPs 1 to 6 form a two-dimensional (2D) net with the bey, a polycatenated 2D net with the sql, a three-dimensional (3D) framework with the 6T9, a 2D net with the 3, 5L2, 2D net with the bey and a one-dimensional (1D) looped chain with the 2, 2, 2, 4C10 topologies, respectively. The distinct topological switch between 5 and 6 in the presence and absence of coordinated/cocrystallized water molecules was triggered under various temperatures through coordination and breakage of Co–O bonds. CPs 1 and 2 exhibit sustained porosities indicated by CO2 adsorption and exhibit high selectivity toward detection of pesticides such as 2, 6-dichloro-4-nitroaniline (2, 6-DCNA) and 4-nitroaniline (4-NA) with low detection limits and good recyclability up to five cycles. Integrating 1-octadecene with a long alkyl chain into 1–5 to modify the surface wettability induces hydrophobicity, which was verified by the measurement of water contact angles.