Pagano, Sandro; Montana, Giuseppe; Wickleder, Claudia; Schnick, Wolfgang published an article in 2009, the title of the article was Urea Route to Homoleptic Cyanates-Characterization and Luminescence Properties of [M(OCN)2(urea)] and M(OCN)2 with M = Sr, Eu.Safety of 2-Methyl-2-propylpropane-1,3-diol And the article contains the following content:
A novel approach for the synthesis of urea complexes and homoleptic cyanates of alk. earth metals and Eu is described. The compounds were fully characterized, including their magnetism and temperature-dependent luminescence properties. A novel approach for the synthesis of urea complexes and homoleptic cyanates of alk. earth metals and Eu is described. Direct reaction of urea with elemental Sr or Eu in closed ampuls at temperatures >120° yields [M(OCN)2(urea)] with M = Sr, Eu. According to single-crystal x-ray diffraction, the isotypic complexes exhibit a layer structure ([Eu(OCN)2(urea)]: space group P21/c, a 7.826(2), b 7.130(1), c 12.916(3) Å, β 99.76(3)°, Z = 4). Also, they were characterized by vibrational spectroscopy, thermal anal., magnetic measurements, and photoluminescence studies. Thermal treatment of [M(OCN)2(urea)] to 160-240° affords evaporation of urea and the subsequent formation of solvent-free homoleptic cyanates of Sr and Eu. The crystal structures of Sr(OCN)2 and Eu(OCN)2 were determined from x-ray powder diffraction data and refined by the Rietveld method. Both compounds crystallize in the orthorhombic space group Fddd and adopt the Sr(N3)2 type structure (Sr(OCN)2: a 6.1510(4), b 11.268(1), c 11.848(1) Å; Eu(OCN)2: a 6.1514(6), b 11.2863(12), c 11.8201(12) Å). The cyanates are stable up to 450°. Above 500° β-Sr(CN)2 and Eu2O2(CN)2 are formed. Excitation and emission spectra of [Eu(OCN)2(urea)], [Sr(OCN)2(urea)]:Eu2+, Eu(OCN)2, Sr(OCN)2:Eu2+ at different temperatures are reported. A strong green emission for all examined Eu-containing compounds due to a 4f6 5d1-4f7 transition is observed at low temperatures The luminescence properties are discussed in detail and are comparable to those of thiocyanates. Compared to the latter, a blue shift of the emission bands is observed due to the higher ionicity. The experimental process involved the reaction of 2-Methyl-2-propylpropane-1,3-diol(cas: 78-26-2).Safety of 2-Methyl-2-propylpropane-1,3-diol
The Article related to europium cyanate urea complex preparation structure thermal decomposition, strontium cyanate urea complex preparation thermal decomposition, luminescence europium cyanate urea complex, crystal structure europium strontium cyanate urea complex and other aspects.Safety of 2-Methyl-2-propylpropane-1,3-diol
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