The intermetallic barium compounds BaTMg2 (T = Pd, Ag, Pt, Au) and BaAuCd2 were synthesized by reactions of the elements in sealed tantalum ampoules in muffle furnaces. The five compounds crystallize with the orthorhombic MgCuAl2 type structure, space group Cmcm, with small differences in chemical bonding between the magnesium and cadmium series. All samples were characterized through their Guinier powder diffraction patterns. The structures of BaPdMg2 (a = 444.57(4), b = 1174.67(10), c = 827.58(7) pm, wR2 = 0.0460, 475 F 2 values, 16 variables), BaAuMg2 (a = 450.27(6), b = 1183.94(16), c = 838.76(11) pm, wR2 = 0.0355, 473 F 2 values, 16 variables) and BaAuCd2 (a = 463.31(5), b = 1112.79(12), c = 826.63(8) pm, wR2 = 0.0453, 469 F 2 values, 16 variables) were refined from single crystal X-ray diffraction data. The large barium atoms push the [TMg2] respectively [AuCd2] substructures apart. This allows fast moisture attack and leads to fast hydrolyzes of the samples when they get in contact with water. The influence of the difference in electronegativity between magnesium and cadmium is reflected for the pair of compounds BaAuMg2 and BaAuCd2. The magnesium compound shows the higher auridic character, while the cadmium compound shows a tendency towards a three-dimensional cadmium substructure.

中文翻译：

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两种子结构中的镁和钡：BaTMg2（T = Pd、Ag、Pt、Au）和具有 MgCuAl2 型结构的同型镉化合物 BaAuCd2

金属间钡化合物Ba吨镁2个(吨= Pd、Ag、Pt、Au) 和 BaAuCd2个是通过马弗炉中密封的钽安瓿中的元素反应合成的。五种化合物与正交晶系 MgCuAl 结晶2个类型结构，空间群厘米厘米, 镁和镉系列之间的化学键差异很小。所有样品均通过其 Guinier 粉末衍射图进行表征。BaPdMg的结构式2个(一个= 444.57(4),b= 1174.67(10),C= 827.58(7) 下午，wR2 = 0.0460, 475F 2个值，16 个变量），BaAuMg2个(一个= 450.27(6),b= 1183.94(16),C= 838.76(11) 下午，wR2 = 0.0355, 473F 2个值，16 个变量）和 BaAuCd2个(一个= 463.31(5),b= 1112.79(12),C= 826.63(8) 下午，wR2 = 0.0453, 469F 2个值，16 个变量）是从单晶 X 射线衍射数据中提炼出来的。大的钡原子推动 [吨镁2个] 分别为 [AuCd2个] 子结构分开。这允许快速水分侵蚀并导致样品与水接触时快速水解。镁和镉之间电负性差异的影响反映在化合物对 BaAuMg 中2个和BaAuCd2个. 镁化合物显示出更高的金质特征，而镉化合物显示出三维镉亚结构的趋势。