Search

In this paper, a Sm(III) cluster-based 2D coordination polymer {[Sm(2-stp)·3(H2O)]·(H2O)}n, (where 2-stp = 2-sulfoterephthalate), 1 has been synthesized hydrothermally and doped into poly(methyl methacrylate (PMMA) fibers through electrospinning technique to get a new 1D luminescent composite fibers, Sm/PMMA. The crystal structure of Sm(III) complex has been determined by single crystal X-ray diffraction measurements. Sm/PMMA composite fibers have been characterized by field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), photoluminescence spectroscopy (PL), and thermogravimetric analysis (TGA) in comparison to that of the pure Sm(III) complex. The luminescent spectra of the composite nanofibers (Sm/PMMA) has demonstrated strong characteristic emission of Sm(III) ions and has also pointed out much better thermal stability than the pure Sm(III) complex.

KARA, Hulya/0000-0002-2032-8930 WOS: 000513242600009 Two new Er(III)-cluster-based coordination compounds have been synthesized by hydrothermal technique using monosodium 2-sulfoterephthalate (2-stp) and 4,4 '-bipyridyl (4,4 '-bpy) ligands. Depending on synthetic procedure, monomeric and polymeric Er(III) products, isolated as {[Er(2-stp)(2)(H2O)(6)]0.2(4,4 '-bipy)0.4(H2O)}, 1 and {[Er(2-stp)(4,4 '-bipy)(H2O)](H2O)}(n), 2. Both compounds have been characterized by elemental analysis, FT-IR, UV-visible and single-crystal X-ray diffraction and solid-state photoluminescence. The X-ray structure analyses show that Er atom is surrounded by two 2-stp ligands which have monodentate connection mode forming a monomeric structure in compound 1. However, in compound 2, Er atoms are coordinated by four bridging 2-stp ligands which adopt a hexadentate connection mode to form a central symmetrically dimeric building unit. The photoluminescence spectrums of the compounds have been exhibited intense blue emission for 1 and cyan-blue emission for 2. The band observed in NIR region at 1532 nm (for 1) and 1540 nm (for 2) are the typical Er-III emission. The excellent NIR luminescent properties, indicating their promising potential applications as gain medium materials in optical amplification devices.

0000-0002-2032-8930 WOS: 000446704800030 A new Er3+-cluster-based 2D coordination polymer with the formula {[Er(SSA)(H2O)(2)](H2O)}(n) (SSA = 5- sulfosalicylic acid), complex 1, has been successfully synthesized via hydrothermal method and structurally characterized by elemental analysis, FT-IR, UV, single crystal and powder X-ray diffraction. Complex 1 reveals the Erbium atom is coordinated to eight oxygen atoms by four symmetry-related SSA ligands and two coordinated water molecules to form a distorted square-antiprismatic geometry. The photoluminescence spectrum of the complex 1 display intense pink emission with CIE chromaticity coordinates (0.540, 0.250). The complex 1 emit NIR luminescence at 1535 nm, which corresponds to the I-4(13/2)-I-4(15/2) transition of Er3+ ion. Moreover, its full width at half maximum values is 113 nm. This complex can potentially be applied to polymeric erbium-doped optical amplifiers, planar waveguides or infrared OLEDs. Research Funds of Mugla Sitki Kocman University [BAP-2016/52]; Dokuz Eylul UniversityDokuz Eylul University [2010.KB.FEN.13] The authors are grateful to the Research Funds of Mugla Sitki Kocman University (BAP-2016/52) for the financial support, Dokuz Eylul University for the use of the Agilent Xcalibur Eos diffractometer (purchased under University Research Grant No. 2010.KB.FEN.13) and Balikesir University, Science and Technology Application and Research Center (BUBTAM) for the use of the Photoluminescence Spectrometer.

0000-0002-2032-8930 WOS: 000446704800003 A new tetranuclear cyanide-bridged Mn-III-Fe-III complex based on manganese(III) Schiff base and hexacyanoferrate(III) units, [Mn(L)(MeOH)(2)][{Mn(L)}{Fe(CN)(6)}{Mn(L)(MeOH)}]center dot 2MeOH, [H2L=N,N'-bis(2-hydroxy-1-naphthalidenato)-1,2-diaminopropane] (1), has been synthesized and characterized by elemental analysis, UV-Vis, FT-IR, PXRD, single crystal X-ray analyses, magnetic and photoluminescence measurements. Complex 1 consist of one trinuclear cyanido-bridged anion, in which [Fe(CN)(6)](3-) anion bridge [Mn(L)](+) and Mn(L)(MeOH)}](+) cations via two C equivalent to N groups in the cis positions, and also one isolated manganese [Mn(L)(MeOH)(2)](+) cation. DC magnetic susceptibility and magnetization studies showed that complex 1 indicates an antiferromagnetic coupling between low-spin Fe(III) and high-spin Mn(III) through the cyanide bridges. In addition, the complex 1 displays a strong cyan-blue luminescence emission in the solid state condition at room temperature. This behavior might be seen easily from the chromaticity diagram. Thus, the complex may be a good promising cyan-blue OLED developing electroluminescent materials for flatted or curved panel display applications due to the fact that it has such features. Research Funds of Mula Stk Kocman University [BAP-2018/008] The authors are grateful to the Research Funds of Mula Stk Kocman University (BAP-2018/008) for the financial support and Balikesir University, Science and Technology Application and Research Center (BUBTAM) for the use of the Photoluminescence Spectrometer. The authors are also very grateful to Prof. Dr. Andrea Caneschi (Laboratory of Molecular Magnetism, Department of Chemistry, University of Florence) for the use of SQUID magnetometer and helpful suggestions.