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THERMAL STUDIES OF 2-AMINOETHANOL COMPLEXES OF NICKEL(II) IN THE SOLID STATE

机译:固态下镍(II)的2-氨基乙醇络合物的热学研究

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NiL(3)]X(2) (where L = 2-aminoethanol and X is Cl-, Br-,I-, NO3-, 0.550(4)(2-) or 0.5SeO(4)(2-)) and [NiL(2)X(2)] (X is Cl-, Br-, or SCN-) have been synthesised from solution and their thermal study has been carried out in the solid phase. [NiL(3)]I-2 and [NiL(3)]SeO4 undergo reversible endothermic phase transitions upon heating (63-93 degrees C and 94-113 degrees C, respectively, for heating and 94-65 degrees C and 110-190 degrees C, respectively, for cooling), whereas [NiL(3)](NO3)(2) exhibits two successive reversible endothermic phase transitions (10-38 degrees C and 50-62 degrees C for heating and 56-48 degrees C and 19-(-8)degrees C for cooling). On the other hand, [NiL(3)]SO4 undergoes irreversible endothermic phase transition (99-112 degrees C) in the solid state. All these transformations are assumed to be associated with the conformational changes of 2-aminoethanol chelate rings. [NiL(2)(NCS)(2)] melts at similar to 168 degrees C and remains supercooled for a few days at ambient temperature. The initial temperatures of decomposition (T-i) of these complexes have been compared with those of the corresponding ethane-1, 2-diamine complexes of nickel (II). [References: 19
机译:NiL(3)] X(2)(其中L = 2-氨基乙醇,X为Cl-,Br-,I-,NO3-,0.550(4)(2-)或0.5SeO(4)(2-)) [NiL(2)X(2)](X为Cl-,Br-或SCN-)已从溶液中合成,并且它们的热学研究已在固相中进行。 [NiL(3)] I-2和[NiL(3)] SeO4加热时会发生可逆的吸热相变(加热时分别为63-93摄氏度和94-113摄氏度,加热时为94-65摄氏度和110-分别为190摄氏度(冷却),而[NiL(3)](NO3)(2)表现出两个连续的可逆吸热相变(加热为10-38摄氏度和50-62摄氏度,以及56-48摄氏度和19-(-8)摄氏度进行冷却)。另一方面,[NiL(3)] SO4在固态下经历不可逆的吸热相变(99-112摄氏度)。假定所有这些转化与2-氨基乙醇螯合环的构象变化有关。 [NiL(2)(NCS)(2)]在类似于168摄氏度的温度下熔化,并在环境温度下过冷几天。已将这些配合物的分解起始温度(T-i)与镍(II)的相应乙烷-1,2-二胺配合物的起始温度进行了比较。 [参考:19

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