Synthesis, structure, topology and magnetic properties of new coordination polymers based on 5(-Br/-COOH)-substituted nicotinic acid

Goutam Nandi*, Ranjit Thakuria, Hatem M. Titi, Ranjan Patra, Israel Goldberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Nine new coordination polymers of 5-substituted nicotinic acid (with either -Br, HBNA, or -COOH, 3,5-H2PDC) with d-transition (Co, Ni, Zn and Cd) and f-lanthanoid (La, Ce, Sm and Tb) metal ions have been synthesized. The two metal complexes [Co2(BNA)4(H2O)] n·H2O (1a) and [Cd(BNA)2]n (1b) have polymorphic/isomeric structures to those of metal-organic-frameworks (MOFs) with similar structural building units (SBUs) reported earlier. Modified reaction conditions yielded new isomeric metal complexes in the present case. Reactions of the 3,5-H2PDC linker with different metal ions led to the formation of polymeric complexes [Mn3(3,5-PDC) 3(DMA)3]n·DMA (2a), [Zn(3,5-PDC)(DMA)] n·DMA (2b) and [Cd2(3,5-PDC)2(DMA) 4]n (2c), as well as lanthanoid MOFs [Sm(3,5-PDC) 1.5(DMF)]n·DMF (2d, as well as isomorphous products with La (2f) and Ce (2g) ions) and [Tb2(3,5-PDC)3(DMF) 2]n·DMF (2e). Networking diversity observed in these coordination polymers with the conformationally rigid 5-substituted nicotinic acid ligand is discussed. The magnetic properties of 2a, 2d and 2e have been studied as well. This journal is

Original languageEnglish
Pages (from-to)5244-5256
Number of pages13
JournalCrystEngComm
Volume16
Issue number24
DOIs
StatePublished - 28 Jun 2014

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