Luminescent Thermometer Based on a Praseodymium(iii) Cyanide-Based Metal-Organic Framework.

Trivalent lanthanide ions have emerged as promising candidates for precise and remote temperature sensing. Among them, Pr-based luminescent thermometers remain underexplored, particularly those operating in the near-infrared (NIR) spectral region. This work presents the synthesis and thorough characterization of a novel Pr-based coordination polymer, {[PrPt(CN)(4,4'-bpyO)(HO)]·4HO} (), as a rare example of Pr luminescent thermometry.

Lanthanide Luminescence Thermometry and Slow Magnetic Relaxation in 3-D Polycyanidometallate-Based Materials.

Two three-dimensional (3-D) polycyanidometallate-based luminescent thermometers with the general formula {LnCo(CN)(4-benpyo)(HO)·7HO} Ln = (Dy(III)(), Eu(III)()), based on the red-emissive diamagnetic linker [Co(CN)] and the bulky pyridine derivative that possesses the N-oxide moiety, 4-benzyloxy-pyridine N-oxide (benpyo), were prepared for the first time. The structure of compound has been determined by single-crystal X-ray crystallography while the purity and structure of have been confirmed by CHN, Fourier transform infrared spectroscopy (FT-IR), and powder X-ray diffraction (PXRD) analysis. Magnetic AC susceptibility measurements at zero field show no single-molecule magnet (SMM) behavior indicating fast relaxation operating in .

Dual Emission in the Near-Infrared and Visible Regions from a Mixed Cyanido-Bridged Eu/Nd(4-OHpy)-Co Layered Material.

Coordination polymers (CPs) with a dual emission spanning from the visible (vis) to near-infrared (NIR) regions of the electromagnetic spectrum are used for optical sensors, medical diagnostics, and telecommunication technologies. We herein report the synthesis, structural characterization, and optical response of heterometallic cyanido-bridged layered {[EuNd(4-OHpy)(HO)][Co(CN)]} CPs, where 4-OHpy = 4-hydroxypyridine, with a multicolor emission profile across the vis and NIR regions. The crystals show an efficient energy transfer (ET) from the 4-OHpy ligand and the [Co(CN)] ions to the Eu and Nd ions, resulting in an enhanced photoluminescence (PL) efficiency.

High-Performance Luminescence Thermometer with Field-Induced Slow Magnetic Relaxation Based on a Heterometallic Cyanido-Bridged 3d-4f Complex.

The 1:1:1 reaction of DyCl·6HO, K[Co(CN)] and bpyO in HO has provided access to a complex with formula [DyCo(CN)(bpyO)(HO)]·4HO () in a very good yield, while [DyFe(CN)(bpyO) (HO)]·4HO () was also precipitated (also in a high yield) using K[Fe(CN)] instead of K[Co(CN)]. Their structures have been determined by single-crystal X-ray crystallography and characterized based on elemental analyses and IR spectra. Combined direct current (dc) and alternating current (ac) magnetic susceptibility revealed slow magnetic relaxation upon application of a dc field.

A nonsymmetric Dy single-molecule magnet with two relaxation processes triggered by an external magnetic field: a theoretical and integrated EPR study of the role of magnetic-site dilution.

The 1 : 2 reaction between Dy(OCMe)·4HO and 1-acetyl-2-napthol (LH) in MeOH has provided access to the complex [DyL(MeOH)]·MeOH (1·MeOH) in a good yield. The structures of the isomorphous complex 1·MeOH and its doped diamagnetic yttrium analogue [DyYL(MeOH)]·MeOH (Dy@Y2) have been determined by single-crystal X-ray crystallography and characterized based on elemental analyses, IR spectra, and powder X-ray patterns. Combined dc and ac magnetic susceptibility and the magnetization data for 1 suggest that this complex shows slow magnetic relaxation.