P-Xylylenediamine derived ligands as flexible connectors in the design of porous coordination polymers. Issue 19 (25th April 2019)

• Record Type: Journal Article
• Authors: Emerson, Adrian J.; Knowles, Gregory P.; Chaffee, Alan L.; Batten, Stuart R.; Turner, David R.
• Is Part Of: CrystEngComm. Volume 21:Issue 19(2019)
• Page Start: 3074
• Page End: 3085
• Publication Date: 2019-04-25
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c9ce00371a
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Flexible tetrabenzoate xylylenediamine-based ligands form both discrete and polymeric assemblies, the latter displaying the targeted amine-lined pore spaces. Abstract : The use of flexible ligands in coordination polymers provides both opportunities and unpredictability. A new series of flexible ligands derived from p -xylylenediamine, which vary in the positioning of carboxylic acid functional groups, have been found to form a series of coordination polymers and a discrete coordination complex. Use of the tetra-substituted meta -carboxylic acid ligand N, N, N ′, N ′-tetra(3-carboxybenzyl)- p -xylylenediamine, isolated as its dihydrochloride salt(H 6 M 4 pxy )Cl 2, resulted in the simultaneous formation of two products from the same synthetic conditions. One of these products was a discrete cage-type coordination complex of the form [Cu4 ( M 4 pxy )2 (DMF)2 (OH2 )] (1 ), while the other product was the two-dimensional coordination polymer poly-[Cu2 ( M 4 pxy )(OH2 )2 ] (2 ). Synthesis utilising the tetra-substituted para -carboxylic acid ligand, isolated as N, N, N ′, N ′-tetra(4-carboxybenzyl)- p -xylylenediamine dihydrochloride(H 6 P 4 pxy )Cl 2, resulted in the formation of multiple two-dimensional coordination polymers, poly-[Cu2 ( P 4 pxy )(DMF)(OH2 )]·2DMF·3H2 O (3 ·2DMF·3H2 O), poly-[Mn2 ( P 4 pxy )(DMA)2 ] (4 ), poly-[Co4 ( P 4 pxy )2 (DMF)2 (μ-OH2 )2 (OH2 )2 ]·6DMF·4H2 O (5 ·6DMF·4H2 O) and poly-[Cd2 ( P 4 pxy )(OH2 )2 ]·DMA·3H2 O (6 ·DMA·3H2 O). The last of these materials, a three-dimensional coordination polymer, was found to adsorb approximately 32 cm 3 g −1 STP of CO2 at atmospheric pressure at 273 K.