Rare earth coordination dinuclear compounds constructed from 3,5-dicarboxypyrazolate and succinate intermetallic bridges†
Marcelo G. Lahoud,Elaine C. Muniz,Guilherme Arroyos,Marcelo A. Fávaro,Marian R. Davolos,Richard F. D'Vries,Javier Ellena,Rafael S. Freitas,Everton Arrighi,Regina C. G. Frem
New Journal of Chemistry Pub Date : 04/08/2016 00:00:00 , DOI:10.1039/C6NJ00140H
Abstract

In this paper we describe the synthesis of a new family of rare earth compounds of general formula [RE2(dcpz)2(suc)(H2O)8]·(H2O)1.5, where RE = Y (1), La (2), Ce (3), Pr (4), Nd (5), Sm (6), Gd (7), Tb (8), Dy (9), Ho (10), Er (11), Tm (12) and Yb (13); dcpz = 3,5-dicarboxypyrazolate; suc = succinate. Single crystal X-ray diffraction studies showed that all the complexes are isostructural and crystallize in the triclinic system, space group P[1 with combining macron]. They exist as dinuclear discrete molecules in which the metallic centers are linked together by dcpz and suc bridges. Hydrogen bonds between dimers give rise to a 3D bcu supramolecular network with topology (424·64). Solid-state photoluminescence studies revealed that the ligand-to-metal energy transfer mechanism is responsible for the visible emission of Sm (6), Tb (8) and Dy (9) compounds while for (5), near-infrared (1060 nm) emission was obtained by the direct excitation f orbitals in the Nd3+ ion. Magnetization measurements indicated antiferromagnetic interactions between the RE3+ ions, except Y3+ (1) and La3+ (2).

Graphical abstract: Rare earth coordination dinuclear compounds constructed from 3,5-dicarboxypyrazolate and succinate intermetallic bridges