大学化学 >> 2022, Vol. 37 >> Issue (11): 2209033.doi: 10.3866/PKU.DXHX202209033

所属专题： 无机化学课程教学(2022)

自学之友 上一篇    

对传统二草酸合铜(II)酸钾化学式的书写纠正

刘絮, 李子峰, 孟祥茹()   

  • 收稿日期:2022-09-13 录用日期:2022-10-12 发布日期:2022-10-31
  • 通讯作者: 孟祥茹 E-mail:mxr@zzu.edu.cn
  • 作者简介:孟祥茹, Email: mxr@zzu.edu.cn
  • 基金资助:
    国家自然科学基金(22071223);国家大学生创新创业训练计划(202210459201)

Correct Way of Writing Traditional Chemical Formulas of Potassium Dioxalato Copper (II)

Xu Liu, Zifeng Li, Xiangru Meng()   

  • Received:2022-09-13 Accepted:2022-10-12 Published:2022-10-31
  • Contact: Xiangru Meng E-mail:mxr@zzu.edu.cn

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摘要：

对二草酸合铜(II)酸钾制备实验所得到的针状和片状晶体进行了单晶结构分析，结果发现：不但Cu2+离子与C2O42−配体配位，处于配合物的内界，而且K+离子也与C2O42−配体配位，存在于内界。此外，H2O也作为桥连配体参与配位。按照配合物化学式的书写规则，针状和片状晶体产物的化学式分别应写作[K2Cu(C2O4)2(H2O)4]n和[K2Cu(C2O4)2(H2O)2]n，而不是K2[Cu(C2O4)2]∙4H2O和K2[Cu(C2O4)2]∙2H2O。本论文纠正了人们长期以来的一个错误认知。

关键词: 二草酸合铜(II)酸钾, 晶体结构, 化学式

Abstract:

The single crystal structure analyses of the acicular and lamellar potassium dioxalato copper(II) crystals indicated that not only Cu2+ but also K+ ions coordinate with C2O42− ligands and locate in the inner boundary of the complexes. In addition, H2O molecules also participate in coordination with Cu2+ or K+ ions as bridging ligands. So, according to the rules of writing of the chemical formula of the complexes, the chemical formulas of the acicular and lamellar crystal products should be written as [K2Cu(C2O4)2(H2O)4]n and [K2Cu(C2O4)2(H2O)2]n and not as K2[Cu(C2O4)2]∙4H2O and K2[Cu(C2O4)2]∙2H2O. This paper provides a clarification to this long-standing misconception.

Key words: Potassium dioxalato copper(II), Crystal structure, Chemical formula