Mössbauer Spectroscopic Investigation of Fe<sup>II</sup>and Fe<sup>III</sup>3,4,5-Trihydroxybenzoates (Gallates) - Proposed Model Compounds for Iron-Gall Inks
作者:Friedrich E. Wagner、Anton Lerf
DOI:10.1002/zaac.201500532
日期:2015.11
in the reaction vessel. If there is no free volume one obtains the same FeIII gallate as in the other preparation methods. With a large free volume another compound was found to form whose composition and structure could not be determined. It could be specified only by Mossbauer spectroscopy. FeIII gallate, the FeII gallate, and the new phase show magnetic ordering at liquid helium temperature.
制备了氧化态为 Fe2+ 和 Fe3+ 的没食子酸铁,并通过穆斯堡尔光谱、X 射线衍射和红外光谱进行了研究。FeIII 3,4,5-三羟基苯甲酸盐(没食子酸盐)Fe(C7O5H4)·2H2O,其结构首先由 Wunderlich 确定,由没食子酸与金属铁反应或氧化得到 FeII 没食子酸盐,其结构由 Wunderlich硫酸亚铁与 3,4,5-三羟基苯甲酸(没食子酸)在缺氧条件下反应。重现 Feller 和 Cheetham 的水热制备方法的试验表明,结果主要取决于反应容器中的游离气体体积。如果没有自由体积,则获得与其他制备方法相同的 FeIII 没食子酸盐。发现具有较大自由体积的另一种化合物形成,其组成和结构无法确定。它只能通过穆斯堡尔光谱来指定。FeIII gallate、FeII gallate 和新相在液氦温度下显示出磁性有序。