The 1:1:1 reaction of YbCl3·6H2O, K3[Co(CN)6] and bpyO2 in H2O has provided access to a complex with formula [YbCo(CN)6(bpyO2)2(H2O)3]·4H2O (1) in a very good yield while its structure has been...

The 1:1:1 reaction of DyCl 3 •6H 2 O, K 3 [Co(CN) 6 ] and bpyO 2 in H 2 O has provided access to a complex with formula [DyCo-(CN) 2) was also precipitated (also in a high yield) using K 3 [Fe(CN) 6 ] instead of K 3 [Co(CN) 6 ]. 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. μ-SQUID measurements and CASSCF calculations revealed high-temperature relaxation dynamics for both compounds. Lowtemperature magnetic studies show the relaxation characteristics for 1, while for compound 2 the dynamics corresponds to an antiferromagnetically coupled Dy••• Fe pair. High-resolution optical studies have been carried out to investigate the performance of compounds 1 and 2 as luminescence thermometers. For 1, a maximum thermal sensitivity of 1.84% K −1 at 70 K has been calculated, which is higher than the acceptable sensitivity boundary of 1% K −1 for high-performance luminescence thermometers in a broad range of temperature between 40 and 140 K. Further optical studies focused on the chromaticity diagram of compound 1 revealed a temperature shift from warm white (3200 K) at 10 K toward a more natural white color near 4000 K at room temperature.

Two 2-D Zr4+ MOFs displaying microporous structures, remarkable stability, exceptional UO22+ sorption capacity and ability to sorb and immobilize UO22+ ions from various types of real-world aqueous media are reported.

The diamagnetic two-dimensional Hofmann-type metal–organic framework [ZnII(2-mpz)2Ni­(CN)4] has been successfully synthesized along with its isostructural hysteretic spin-crossover FeII analogue in the form of both bulk microcrystalline powder and nanoparticles. Detailed atomic force microscopy topographic study revealed a nanogrowth relationship between the height and length of the nanoparticle.

Two three-dimensional (3-D) polycyanidometallate-based luminescent thermometers with the general formula {Ln4Co4(CN)24(4-benpyo)17(H2O)·7H2O} n Ln = (Dy­(III)­(1), Eu­(III)­(2)), based on the red-emissive diamagnetic linker [Co­(CN)6]3– 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 1 has been determined by single-crystal X-ray crystallography while the purity and structure of 2 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 1. Upon application of an optimal field of 2 kOe, the SMM character of compound 1 is revealed while the τ­(Τ) can be reproduced solely considering the Raman process τ–1 = CT n with C = 7.0901(3) s–1 K–n and n = 3.58(1), indicating that a high density of low-lying states and optical as well as acoustic phonons play a major role in the relaxation mechanism. Micron-sized superconducting quantum interference device (μ-SQUID) loops show a very narrow opening in agreement with the AC susceptibility studies and complete active space self-consistent field (CASSCF) calculations. The interaction operating between the Dy­(III) ions was quantified from CASSCF calculations. Good agreement is found by fitting the experimental DC χM Τ(Τ) and M(H), employing the Lines model, with J Lines = −0.087 cm–1 (−0.125 K). The excitation spectra of compound 2 are used for temperature sensing in the 25–325 nm range with a maximum relative thermal sensitivity, S r = 0.6% K–1 at 325 K, whereas compound 1 operates as a luminescent thermometer based on its emission features in the temperature range of 16–350 K with S r ≈ 2.3% K–1 at 240 K.