Synthesis and Crystal Structure of Complexes of Rare Earth(Ⅲ) Isothiocyanate with N-(p-chlorophenyl)aza-15-Crown-5

Abstract

Abstract: Twelve 1:1 complexes of rare earth(Ⅲ) isothiocyanate with N-(p-chlorophenyl)aza 15-crown-5 were synthesized and characterized by elementary analyses,conductivity measurements,UVspectra,IRspectra and TG-DATanalyses.The crystal and molecular structures of C₁₉H₂₄N₄O₄S₃ClSm were determined by single-crystal X-ray diffraction.The unit-cell is triclinic,space group P1 with a=0.8422(3) nm,b=0.9056(1) nm,c=1.7041(6) nm,α=93.88(1)°β=102.25(3)°,γ=98.85(2)°,V=1.2482 nm³,M=654.34,Z=2,D_x=1.74 g/cm³,R=0.045,R_w=0.056.The Sm³⁺ deviates from the plane of the four ether oxygens by 0.1482 (±0.006) nm and is coordinated to every hetero-atom in the polyether ring,and is also coordination to the nitrogen atoms of three isothiocyanates,and the average bond distance is as follows:Sm-O(ether)0.2500 nm,Sm-N(SCN)0.2390 nm,Sm-N 0.2712(5) nm.The coordination number of Sm³⁺ ion is eight.

Key words: Complexes of rare earth elements, Crown-ether, Crystal structure

TrendMD:

LUO Lan, WEI Ming-Li, YAN Shi-Ping, WANG Geng-Lin, WANG Hong-Gen, YAO Xin-Kan . Synthesis and Crystal Structure of Complexes of Rare Earth(Ⅲ) Isothiocyanate with N-(p-chlorophenyl)aza-15-Crown-5[J]. Chem. J. Chinese Universities, 1992, 13(10): 1201.

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