Synthesis, characterization, DFT calculations and antimicrobial studies of cadmium(II) sulfate complexes of thioureas and 2-mercaptopyridine; X-ray structures of polymeric diaqua(N,N′-dimethylthiourea) sulfatocadmium(II) and bis(2-mercaptopyridine)sulfatocadmium(II)

Ahmad, Saeed; Saleem, Muhammad; Georgieva, Ivelina; Rüffer, Tobias; Schaarschmidt, Dieter; Lang, Heinrich; Murtaza, Ghulam; Hussain, Irshad; Habib-ur-Rehman, _; Isab, Anvarhusein A.; Malik, Muhammad Riaz; Ali, Saqib

doi:10.1016/j.poly.2018.04.035

Cited by 4 publications

(1 citation statement)

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“…N , N ′-Dimethylthiourea was taken as a sulfur(-2)-containing ligand. The interaction of thiourea (TU) and its derivatives with metal ions has been the subject of several investigations because of the relevance of their binding sites to those in living systems. − Thiourea derivatives may coordinate to a metal ion with a variety of coordination modes, and they may exist in syn–syn, syn–anti, and anti–anti conformations . They are widely used in crystal engineering as tectons because of the reliability of the hydrogen bonding patterns that they define. , Thiourea forms noncentrosymmetric complexes when combined with inorganic salts resulting in enhanced NLO activity. − The photoluminescence (PL) spectra showed that emission is in the blue region for some synthesized crystals of the thiourea metal complexes with a little Stokes shift. − Alternatively, the red-colored PL emission with single peak maxima centered at 607 nm in the K(TU)Cl crystal and two emission bands at 358 and 547 nm in Zn(TU) 2 (CH 3 COO) 2 were detected.…”

Section: Introductionmentioning

confidence: 99%

Luminescent Zero-Dimensional Hybrid Lead Thiohalide Nanostructures for High Quantum Yield and Broadband Excitation

Головнев

Aleksandrovsky

Gerasimova

et al. 2021

ACS Appl. Nano Mater.

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Luminescent trans-[Pb(DMTU-S) 4 Cl 2 ] (DMTU: N,N′-dimethylthiourea) was designed and prepared via either mechanochemical or solvothermal methods, and the structures of DMTU and trans-[Pb(DMTU-S) 4 Cl 2 ] have been resolved using Xray single-crystal diffraction. Upon excitation over broadband covering the range from 450 to 250 nm, trans-[Pb(DMTU-S) 4 Cl 2 ] shows yellow-green emission peaking at 549 nm with a spectral width of 110 nm, which is assigned to the triplet−singlet transition of Pb 2+ ions within distorted heterogeneous S 4 Cl 2 octahedra. The broadband excitation comprised singlet−singlet transitions of Pb 2+ ions and energy transfer from orbitals involving those of organic ligands. Simultaneous analysis of the luminescent bandwidth and Stokes shift gives for Pb 2+ ions in S 4 Cl 2 octahedra the value of the Huang−Rhys parameter S = 4.25 and the energy of phonon involved in the formation of the luminescence spectrum of the order of 90 meV. Quantum yield as high as 91% is detected for excitation at 365 nm. This high quantum yield indicates the absence of noticeable concentration quenching at an average distance of 9.4 Å between the Pb 2+ ions within the structure of trans-[Pb(DMTU) 4 Cl 2 ]. The weak spin−orbit intersystem crossing is deduced from a high photoluminescence quantum yield (PLQY) value. Time dependent-density functional theory (TD-DFT) calculations of the nanocluster indicate the red shift of absorption bands in Pb(DMTU) 4 Cl 2 with respect to parent DMTU. The high-performance photoluminescence and stability demonstrated promising applications in photonics.

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