2,4-dimethoxybenzoic acid ammonium salt | 288142-05-2

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 2,4-dimethoxybenzoic acid ammonium salt
• 英文别名: ammonium 2,4-dimethoxybenzoate；azanium;2,4-dimethoxybenzoate
• CAS: 288142-05-2
• 化学式: C₉H₉O₄*H₄N
• 分子量: 199.207
• InChiKey: CLPMUURNVIBNPO-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.44
• 重原子数：
  14
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.22
• 拓扑面积：
  59.6
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  氯化镥(III) 、 2,4-dimethoxybenzoic acid ammonium salt 以 水 为溶剂， 生成 Lu(2,4-dimethoxybenzoate)3
  参考文献：
  名称：

  摘要：

  The complexes of yttrium and heavy lanthanides with 2,4-dimethoxybenzoic acid of the formula: Ln(C9H9O4)(3). nH(2)O, where Ln=Tb(III), Dy(III), Ho(III), Er(III), Tm(III), Yb(III), Lu(III) and Y(III), n=2 for Tb(III), Dy(III), Ho(III), Er(III), Tm(III) and Y(III), and n=0 for Yb(III) and Lu(III), have been synthesized and characterized by elemental analysis, IR spectroscopy, themogravimetric studies, as well as X-ray and magnetic susceptibility measurements. The complexes have a colour typical of Ln(3+) salts (Tb, Dy, Tm, Yb, Lu, Y - white, Ho - cream, Er - pink). The carboxylate group in these complexes is a bidentate, chelating ligand. The compounds form crystals of various symmetry. 2,4-Dimethoxybenzoates of Yb(III) and Lu(III) are isostructural. 2,4-Dimethoxybenzoates of yttrium and heavy lanthanides decompose in various ways on heating in air to 1173 K. The hydrated complexes first lose water to form anhydrous salts and then decompose to the oxides of respective metals. The ytterbium and lutetium 2,4-dimethoxybenzoates decompose in one step to form Yb2O3 and Lu2O3.The solubilities of the 2,4-dimethoxybenzoates of yttrium and heavy lanthanides in water and ethanol at 293 K are of the order of: 10(-3) and 10(-3)-10(-2) mol dm(-3), respectively. The magnetic moments for the complexes were determined over the range of 77-298 K. They obey the Curie-Weiss law. The results show that there is no influence of the ligand field on the 4f electrons of lanthanide ions.

  DOI：

  10.1023/a:1010120911658

文献信息

• Lanthanide complexes with 2,4-dimethoxybenzoic acid
  作者：S. D. Padalka、F. A. Kolokolov、D. V. Kolechko、V. T. Panyushkin

  DOI：10.1134/s1070363211100276

  日期：2011.10

  In this connection, we carried out synthesis of the lanthanides complex compounds with 2,4-dimethoxybenzoic acid (HL) [LnL3(H2O)2]·6H2O, where Ln = Sm, Eu, Gd, Tb, Dy. The complex compounds were synthesized by the reaction of water–alcohol solution of the corresponding lanthanide chloride and the ligand ammonium salt in a 1:5 molar ratio at pH ≈ 6.5. The resulting precipitate was filtered off, washed

  为此，我们用2,4-二甲氧基苯甲酸(HL)[LnL3(H2O)2]·6 合成了镧系络合物，其中Ln = Sm、Eu、Gd、Tb、Dy。通过相应的镧系元素氯化物的水-醇溶液与配体铵盐以 1:5 的摩尔比在 pH ≈ 6.5 下反应合成络合物。滤出所得沉淀，用醇、水洗涤并在空气中干燥。
• ——
  作者：W. Ferenc、A. Walków-Dziewulska

  DOI：10.1023/a:1022280909229

  日期：——

  The physico-chemical properties and thermal stability in air of light lanthanide 2,3-, 2,4- and 3,4-dimethoxybenzoates were compared and the influence of -OCH3 substituent on their thermal stability was investigated. The complexes of these series are crystalline, hydrated or anhydrous salts with colours typical of Ln(3+) ions. The carboxylate group is a bidentate, chelating (2,4- and 3,4-dimethoxybenzoates) or tridentate chelating and bridging ligand (2,3- dimethoxybenzoates). The thermal stability of 2,4-, 3,4- and 2,3- dimethoxybenzoates of light lanthanides was studied in the temperature range 273-1173 K.The positions of methoxy groups in benzene ring influence the thermal properties of the complexes and their decomposition mechanism.