Terbium and Europium Chlorocyananilate-Based 2D Coordination Polymers.

ABSTRACT: Two-dimensional layered coordination polymers based on the hetero-substituted 3-chloro-6-cyano-2,5-dihydroxybenzoquinone ligands, hereafter ClCNAn^2- anilate, and Ln^III ions (Tb and Eu) are reported. Compounds 1 and 2, formulated as Ln₂(ClCNAn)₃(DMSO)₆ (Ln^III = Tb, 1; Eu, 2), and their related intermediates 1' and 2', formulated as Ln₂(ClCNAn)₃(H₂O)_x·yH₂O (x + y likely = 12, Ln = Tb, 1'; and Eu, 2'), were prepared by a conventional one-pot reaction (the latter) and recrystallized from DMSO solvent (the former). Polyhydrated intermediates 1' and 2' show very similar XRPD patterns, while, despite their common stoichiometry, 1 and 2 are not isostructural. Compound 1 consists of a 2D coordination framework of 3,6 topology, where [Tb(DMSO)₃]^III moieties are bridged by three bis-chelating ClCNAn^2- ligands, forming distorted hexagons. Ultrathin nanosheets of 1 were obtained by exfoliation via the liquid-assisted sonication method and characterized by atomic force microscopy, confirming the 2D nature of 1. The crystal structure of 2, still showing the presence of 2D sheets with a "hexagonal" mesh and a common (3,6) connectivity, is based onto flat, non-corrugated slabs. Indeed, at a larger scale, the different "rectangular tiles" show clear roofing in 1, which is totally absent in 2. The magnetic behavior of 1 very likely indicates depopulation of the highest crystal-field levels, as expected for Tb^III compounds.

SUBMITTER: Oggianu M 

PROVIDER: S-EPMC10535540 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature