Organically pillared layer framework of [Eu(NH2-BDC)(ox)(H3O)]

Supaphorn Thammakan; Kitt Panyarat; Apinpus Rujiwatra

doi:10.1107/S2056989019014713

Organically pillared layer framework of [Eu(NH₂-BDC)(ox)(H₃O)]

Acta Crystallogr E Crystallogr Commun. 2019 Nov 8;75(Pt 12):1833-1838. doi: 10.1107/S2056989019014713. eCollection 2019 Dec 1.

Authors

Supaphorn Thammakan¹, Kitt Panyarat¹, Apinpus Rujiwatra^{1

2}

Affiliations

¹ Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand.
² Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand.

Abstract

The non-porous three-dimensional structure of poly[(μ₅-2-amino-benzene-1,4-di-carboxyl-ato)(μ₆-oxalato)(oxomium)europium(III)], [Eu(C₈H₅NO₄)(C₂O₄)(H₃O)] _n or [Eu^III(NH₂-BDC)(ox)(H₃O)] _n (NH₂-BDC^2- = 2-amino-terephthalate and ox^2- = oxalate) is constructed from two-dimensional layers of Eu^III-carboxyl-ate-oxalate, which are connected by NH₂-BDC^2- pillars. The basic structural unit of the layer is an edge-sharing dimer of TPRS-{Eu^IIIO₉}, which is assembled through the ox^2- moiety. The intra-layer void is partially occupied by TPR-{Eu^IIIO₆} motifs. Weak C-H⋯O and strong, classical intra-molecular N-H⋯O and inter-molecular O-H⋯O hydrogen-bonding inter-actions, as well as weak π-π stacking inter-actions, affix the organic pillars within the framework. The two-dimensional layer can be simplified to a uninodal 4-connected sql/Shubnikov tetra-gonal plane net with point symbol {4⁴.6²}.

Keywords: 2-aminoterephthalic acid; coordination polymer; crystal structure; lanthanide; oxalic acid.

Grants and funding

This work was funded by Thailand Research Fund grant RSA6280003 to Apinpus Rujiwatra. Science Achievement Scholarship of Thailand grant .