Luminescent lanthanide mixed N-phthaloylglycinate and terephthalate coordination polymers: Structural and optical properties

Author(s)

Arruda, Joaldo G. ; Faustino, Wagner M. ; Pesci, Rafaela B. P. ; Miranda, Victor M. ; Deflon, Victor M. ; Brito, Hermi F. ; Costa, Israel F. ; Terraschke, Huayna ; Teotonio, Ercules E. S.

• Document type: Journal article
• Source: LUMINESCENCE; v. 39, n. 1, p. 8-pg., 2023-10-11.

Abstract

A new class of lanthanide mixed-carboxylate ligands compounds with formula {[Ln(2)(phthgly)(4)(bdc)(H2O)(6)]<middle dot>(H2O)(4)}(infinity), labelled as Ln(3+): Eu (1) and Gd (2) coordination polymers (CP) were synthesized under mild reaction conditions between lanthanide nitrate salts and a solution of N-phthaloylglycine (phthgly) and terephthalic (bdc) ligands. The (1) and (2) coordination polymers were formed by symmetric binuclear units, in which phthgly and bdc carboxylate ligands are coordinated to the lanthanide ions by different coordination modes. Surprisingly, all organic ligands participate in hydrogen bonding interactions, forming an extremally rigid crystalline structure. The red narrow emission bands from the D-5(0)-> F-7(J) transitions of the Eu3+ ion show a high colour purity. The intramolecular energy transfer process from L -> Eu3+ ion has been discussed. The experimental intensity parameters (Omega(2,4)) reflect lower angular distortion and polarizability of the chemical environment around the metal ion compared with other Eu3+ compounds reported in the literature. This novel class of coordination polymer offers a more attractive platform for developing luminescent functional materials for different applications. (AU)

• FAPESP's process: 22/12709-3 - Photophysical properties of lanthanide charge transfer complexes with organic semiconductors for applications in OLEDs
• Grantee: Israel Ferreira da Costa
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 21/08111-2 - Development of rare earth based light converters: luminescent markers, optical sensors, and amplifiers
• Grantee: Hermi Felinto de Brito
• Support Opportunities: Research Projects - Thematic Grants