Synthesis of phosphonosulfonic acid building blocks as linkers for coordination polymersElectronic supplementary information (ESI) available: Linker synthesis and characterization, [La4(H2L)3(H2O)8] synthesis and characterization, PXRD data, and X-ray crystallographic files. CCDC 1547972. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c7nj01697b

• Main Authors: Beyer, O, Homburg, T, Albat, M, Stock, N, Lüning, U
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/c7nj01697b

Ten aromatic building blocks ( 8-11 , 23-28 ) containing phosphonic and sulfonic acid groups within one molecule were synthesized. Twofold nucleophilic substitution starting from 1,2,4,5-tetrakis(bromomethyl)benzene ( 1 ) followed by hydrolysis gave building blocks 8-11 . To obtain building blocks 23-28 , the respective bromobenzenesulfonic acids 13 , 16 , 18-20 and 22 had to be synthesized first. Palladium-catalysed cross coupling with triethylphosphite followed by hydrolysis gave the desired building blocks with phosphonic and sulfonic acid groups. Building block 9 was successfully used as a linker for the synthesis of a new La-based CP with the composition [La 2 (H 2 L) 1.5 (H 2 O) 4 ]. Ten benzene based linkers containing sulfonic and phosphonic acids have been synthesized. One lanthanum MOF was isolated and characterized.