Müller-Buschbaum, KlausYoussef, HebaHebaYoussef2023-11-022023-11-022023https://jlupub.ub.uni-giessen.de/handle/jlupub/18583http://dx.doi.org/10.22029/jlupub-17947The synthesis and characterization of new coordination polymers and complexes of the lanthanide series (Ln), besides heterobimetallic compounds of lanthanides and alkaline earth metals with the N-donor ligands 3-(2-pyridyl)pyrazole (2-PyPzH), 3-(3-pyridyl)pyrazole (3-PyPzH), and 3-(4-pyridyl)pyrazole (4-PyPzH) and the characterization of their photophysical and magnetic properties, have been achieved. Chapter ‎1 provides an introduction to lanthanides and their photoluminescence and magnetic properties, as well as a literature survey of some N-donor ligands besides known coordination compounds of trivalent lanthanide elements with 2-PyPzH and its derivatives; no previous lanthanide-containing compounds with 3-PyPzH and 4-PyPzH have been reported in the literature. Research goals are stated in Chapter ‎2. In Chapter 3 and along the way to study the interaction between luminescence and magnetism within lanthanide-based coordination polymers (CPs), a synthesis of 76 CPs and complexes was achieved. Three series of 35 homoleptic 3D-, 2D-, and 1D-coordination polymers were prepared by redox reactions of elemental lanthanides with 2-PyPzH, 3-PyPzH, and 4-PyPzH. Three heteroleptic 2D-networks, including divalent europium, were also prepared as an example of another Ln oxidation state. Three heterobimetallic lanthanide/alkaline earth complexes and two alkaline earth complexes were synthesized by solvothermal synthesis of elemental lanthanide and/or alkaline earth metals (AE) with 2-PyPzH. The synthesis and structural characterization of 33 heteroleptic 3D- and 2D-coordination polymers and complexes, some of which are polymorphic, were achieved, along with salt-like complexes that differ in constitution and structural extension of lanthanide chlorides together with 2-PyPzH and 3-PyPzH. Studying the photophysical properties of the synthesized CPs and complexes, one of the main goals, has revealed: 1. Unique pink through orange to bright red emitting Ce3+-based 2D-networks, 3D-frameworks, and complexes are unusual cases of emission colors of Ce3+, which marks an example of a strong reduction of the excited 5d states of Ce3+. 2. The pyridylpyrazole/ates act as excellent photoluminescence sensitizers in trivalent lanthanide coordination compounds by increasing the intensity of the characteristic 4f–4f metal ion emission. The high luminescence efficiency is indicated by excellent to moderate quantum yields from 92 %, 76 % to 74 % for Tb3+ and up to 6 % for Eu3+ frameworks and complexes, for instance. 3. Tuning the luminescence chromaticity from green to yellow and red towards white light emission is achieved by co-doping the Gd-containing frameworks with Eu3+ and Tb3+, as well as the co-doping of Eu3+ with Tb3+ and vice versa. 4. The study ligands do not only pass a strong antenna effect for the Ln3+ emitters in the visible region but also for the near-infrared (NIR) emitters. Uncommon NIR emission bands of Tm3+ and Ho3+ besides Pr3+, Er3+, and Nd3+ were detected. Another goal was to characterize the magnetic properties using direct current (DC) measurements. The DC magnetic susceptibility studies show weak ferromagnetic interactions for Ho3+ and absence of interatomic interactions for Dy3+ and Er3+, which limits the study of the interaction between the magnetic and photophysical properties.enAttribution-NonCommercial-NoDerivatives 4.0 InternationalLanthanidesLuminescenceCoordination polymersddc:540