Journal article

Publication year: 2022

Journal: Inorganics

Volume number: 10

Issue number: 12

eISSN: 2304-6740

Open access status: Gold

DOI Link: https://doi.org/10.3390/inorganics10120254

Publisher: MDPI

Abstract: 
A series of 18 lanthanide-containing 1D-coordination polymers (1)(infinity)[Ln(2)(2-PyPzH)(4)Cl-6], Ln = La, Nd, Sm, dinuclear polymorphic complexes alpha-, beta-[Ln(2)(2-PyPzH)(4)Cl-6], Ln = Sm, Eu, Gd, alpha-[Tb-2(2-PyPzH)(4)Cl-6], and [Gd-2(2-PyPzH)(3)(2-PyPz)Cl-5], mononuclear complexes [Ce(2-PyPzH)(3)Cl-3], [Ln(2-PyPzH)(2)Cl-3], Ln = Tb, Dy, Ho, and Er, and salt-like complexes [Gd-3(2-PyPzH)(8)Cl-8]Cl and [PyH][Tb(2-PyPzH)(2)Cl-4] were obtained from the reaction of the respective lanthanide chloride with the 3-(2-pyridyl)pyrazole (2-PyPzH) ligand at different temperatures. An antenna effect through ligand-to-metal energy transfer was observed for several products, leading to the highest luminescence efficiency displayed by a quantum yield of 92% in [Tb(2-PyPzH)(2)Cl-3]. The Ce3+ ion in the complex [Ce(2-PyPzH)(3)Cl-3] exhibits a bright and orange 5d-based broadband emission with a maximum at around 600 nm, marking an example of a strong reduction of the 5d-excited states of Ce(III). The absorption spectroscopy shows ion-specific 4f-4f transitions, which can be assigned to Nd3+, Sm3+, Eu3+, Dy3+, Ho3+, and Er3+ in a wide spectral range from UV-VIS to the NIR region.

Harvard Citation style: Youssef, H., Sedykh, A., Becker, J., Taydakov, I. and Mueller-Buschbaum, K. (2022) 3-(2-Pyridyl)pyrazole Based Luminescent 1D-Coordination Polymers and Polymorphic Complexes of Various Lanthanide Chlorides Including Orange-Emitting Cerium(III), Inorganics, 10(12), Article 254. https://doi.org/10.3390/inorganics10120254

APA Citation style: Youssef, H., Sedykh, A., Becker, J., Taydakov, I., & Mueller-Buschbaum, K. (2022). 3-(2-Pyridyl)pyrazole Based Luminescent 1D-Coordination Polymers and Polymorphic Complexes of Various Lanthanide Chlorides Including Orange-Emitting Cerium(III). Inorganics. 10(12), Article 254. https://doi.org/10.3390/inorganics10120254