四氯合锰（Ⅱ）、四氯合钴（Ⅱ）酸正十烷铵固－固相变的研究

STUDY OF SOLID-SOLID PHASE TRANSITIONSFOR (n-C_(10)H_(21)NH_3)_2MnCl_4AND (n-C_(10)H_(21)NH_3)_2CoCl_4

合成了四氯合锰（Ⅱ）酸正十烷铵（Ｃ１０Ｍｎ）和四氯合钴（Ⅱ）酸正十烷铵（Ｃ１０Ｃｏ）两种物质，进行了元素分析，并用ＤＳＣ，ＩＲ对它们进行了研究．发现存在一个固－固相变，且有较高的焓变值和熵变值（△Ｈ＝３５～４０ｋＪ·ｍｏｌ－１，△Ｓ＝１１０～１２０Ｊ·ｍｏｌ－１·Ｋ－１），在较高的温度下具有化学稳定性，因此，Ｃ１０Ｍｎ，Ｃ１０Ｃｏ可作为贮热物质．

The his (n-Decylammonium) tetrachlorometallates(Ⅱ) (C10M,M=Cu,Zn,Cd,Hg,Mn,Fe,Co,Ni) which are one kind of potential thermal storage material. In this paper, (n-C_(10)H_(21)NH_3 )_2MnCl_4 and (n-C_(10)H_(21)NH_3 )_2CoCl_4 were synthesized, elemental analysis was carried out. The solid-solid phase transitions forC10M (M = Mn, Co) were studied using DSC, IR. The kind of solid-solid phasetransitions were observed. The enthalpies and entropies are higher (△H= 35～40kJ· mol￣(-1), △S = 110 ～ 120 J·mol￣(-1)· K￣(-1), they are chemically stable even atmoderaterly high temparatures, so that C10Mn and C10Co are potential thermal energy storage materials.