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Ca-, Sr-, and Ba-Coordination polymers based on anthranilic acid via mechanochemistry

DOI: 10.1039/C9DT00991D DOI Help

Authors: Abdal-Azim Al-Terkawi (Humboldt-Universität zu Berlin; Federal Institute for Materials Research and Testing (BAM); Université de Montpellier) , Gudrun Scholz (Humboldt-Universität zu Berlin) , Carsten Prinz (Federal Institute for Materials Research and Testing (BAM)) , Franziska Emmerling (Humboldt-Universität zu Berlin; Federal Institute for Materials Research and Testing (BAM)) , Erhard Kemnitz (Humboldt-Universität zu Berlin)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Dalton Transactions , VOL 48 , PAGES 6513 - 6521

State: Published (Approved)
Published: May 2019

Abstract: Ca-, Sr-, and Ba-Based coordination polymers (CPs) were prepared mechanochemically by milling metal-hydroxide samples with anthranilic acid (oABAH). {[Ca(oABA)2(H2O)3]}n (1) consists of one-dimensional polymeric chains that are further connected by a hydrogen-bonding network. {[Sr(oABA)2(H2O)2]·H2O}n (2) is a one-dimensional CP in which water molecules bridge Sr2+ ions and increase the dimensionality by building an extended network. {[Ba(oABA)2(H2O)]}n (3) crystallizes as a two-dimensional CP comprising one bridging water molecule. The cation radii influence the inorganic connectivity and dimensionality of the resulting crystal structures. The crystal structures were refined from powder X-ray diffraction data using the Rietveld method. The local coordination environments were studied via extended X-ray absorption fine structure (EXAFS) measurements. The compounds were further characterized using comprehensive analytical methods such as elemental analysis, thermal analysis, MAS NMR, imaging, and dynamic vapor sorption (DVS) measurements. Compounds 1, 2, and 3 exhibit small surface areas which decrease further after thermal annealing experiments. All compounds exhibit a phase transformation upon heating, which is only reversible in 3.

Subject Areas: Chemistry, Materials

Instruments: B18-Core EXAFS

Added On: 29/11/2019 10:29

Discipline Tags:

Inorganic Chemistry Organic Chemistry Materials Science Polymer Science Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Extended X-ray Absorption Fine Structure (EXAFS)