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1 INTRODUCTIONInstead of the traditional organo-phosphate or phosphorus extractents which ultimately create undesirable waste even after incineration [1], some organic amides[2] have been suggested as possible extractents for the separation of lanthanides, such as (R1R2NCO)2(CH2)n [3,4]. As excellent ligands, diamides show stability, low toxicity and can be synthesized by simple methods. Hudson and his colleagues have synthesized a series of malondiamides and studied the structures of t… 相似文献
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1 INTRODUCTION Polythiotungstate complexes can be prepared from the protonation of one sulfur atom of [WS4]2- and subsequent intramolecular redox reactions[1,2]. For example, [(S)2W(m-S)2W(m-S)2W(S)2]2 was formed by the acidification of a diluted aqueous solution of (NH4)2[WS4] with dilute H2SO4[3]. When a diluted aqueous solution containing [WS4]2 was acidified with 0.1mol/L HCl, [(S)2W(m-S)2(O)- W(H2O)(m-S)2W(S)2]2 was formed[4]. [(S)2W- (m-S)2(S)W(m-S)2W(S)2]2 was form… 相似文献
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The reaction of [Et4N]2WS4 with 4 equiv of CuCN in pyridine produced a new polymeric complex [WS4Cu4(Py)4(μ-CN)2]∞ 1, whose crystal structure has been characterized by single-crystal X-ray analysis. 1 (C22H2oCu4N6S4W, Mr=934.71) crystallizes in monoclinic, space group P21/n with a ='8.994(2), b=16.038(3), c=12.026(3) A, β= 90.85(1)°, V= 1734.6(6) A3, Z=2, Dc=1.789 g/cm3, F(000)=896,t(MoKa)=59.8 cm-1 and T=193 K. The structure was refined to R=0.064 and Rw=0.080 for 2209 observed reflections (I > 3.0σ(I)). The X-ray analysis shows that the tetrahedral WS4 core is coordinated by four Cu atoms, forming a saddle-like WS4Cu4 unit. These repeating units are further interconnected by four Cu-μ-CN-Cu 2.726(2) and 2.723(2) A, respectively. 相似文献
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