The synthesis and crystal structure (100 K) of the title compound, [Fe(C10H11BrN3OS)2]NO3·H2O, is reported. The asymmetric unit consists of an octahedral [FeIII(HL)2]+ cation, where HL
− is H-5-Br-thsa-Et or 5-bromosalicylaldehyde 4-ethylthiosemicarbazonate(1−) systematic name: 4-bromo-2-[(4-ethylthiosemicarbazidoidene)methyl]phenolate}, a nitrate anion and a noncoordinated water molecule. Each HL
− ligand binds via the thione S, the imine N and the phenolate O atom, resulting in an FeIIIS2N2O2 chromophore. The ligands are orientated in two perpendicular planes, with the O and S atoms in cis and the N atoms in trans positions. This [Fe(HL)2](anion)·H2O compound contains the first known cationic FeIII entity containing two salicylaldehyde thiosemicarbazone derivatives. The FeIII ion is in the high-spin state at 100 K. In addition, a comparative IR spectroscopic study of the free ligand and the ferric complex is presented, demonstrating that such an analysis provides a quick identification of the degree of deprotonation and the coordination mode of the ligand in this class of metal compounds. The variable-temperature magnetic susceptibility measurements (5–320 K) are consistent with the presence of a high-spin FeIII ion with a zero-field splitting D = 0.439 (1) cm−1.
报告了标题化合物 [Fe(
C10H11BrN3OS)2]NO3-
H2O的合成和晶体结构(100 K)。不对称单元由八面体 [FeIII(HL)2]+ 阳离子组成,其中 HL
- 是 H-5-Br-thsa-Et 或 5-bromOSalicylaldehyde 4-ethylthiOSemicarbazonate(1-) 系统名称:4-bromo-2-[(4-ethylthiOSemicarbazidene)methyl]phenolate},一个
硝酸根阴离子和一个非配位
水分子。每个 HL
-
配体通过
硫酮 S、
亚胺 N 和
苯酚 O 原子结合,形成 FeIIIS2
N2O2 发色团。
配体在两个垂直平面上定向,O 原子和 S 原子在顺式位置,N 原子在反式位置。这种[Fe(HL)2](阴离子)- 化合物含有第一个已知的阳离子 FeIII 实体,其中含有两个
水杨醛硫代
氨基
脲衍
生物。在 100 K 时,FeIII 离子处于高自旋态。此外,研究人员还对游离
配体和
铁络合物进行了红外光谱对比研究,结果表明这种分析可以快速确定
配体在这类
金属化合物中的去质子化程度和配位模式。变温磁感应强度测量结果(5-320 K)与零场分裂 D = 0.439 (1) cm-1 的高自旋 FeIII 离子的存在相一致。