Mixed-valence phosphato–hydrogenphosphato–iron network compounds<sup>1</sup><sub>∞</sub>{[C<sub>4</sub>N<sub>2</sub>H<sub>11.6</sub>]<sub>1.5</sub>[Fe<sup>II</sup>Fe<sup>III</sup>(PO<sub>4</sub>)(H<sub>0.8</sub>PO<sub>4</sub>)<sub>2</sub>]·H<sub>2</sub>O} and<sup>3</sup><sub>∞</sub>[Fe<sup>II</sup><sub>5</sub>Fe<sup>III</sup><sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>(H<sub>0.5</sub>PO<sub>4</sub>)<sub>4</sub>]: structure elucidation with the help of Mössbauer spectroscopy and a caveat on X-ray diffraction
from which the average protic hydrogen occupation on HPO4 and piperazinedium is calculated to be 0.8. At 4 K there is an intervalence tunneling process between part of the Fe2+ and Fe3+ atoms. Compound 1 contains linear strands of corner-sharing FeO4} and PO4} tetrahedra. The Fe atoms are bridged by Fe–O–P–O–Fe and Fe–O–Fe linkages. The strands are held together by hydrogen bonding interactions involving
的混合价磷酸铁1 ∞ [C 4 Ñ 2 ħ 11.6 ] 1.5的[Fe II的Fe III(PO 4)(H 0.8 PO 4)2 ]·H 2 ö}(1)和3 ∞的[Fe II 5通过水热法合成了Fe III 2(PO 4)2(H 0.5 PO 4)4 ](2)。它们的晶体结构由单晶X射线衍射 和莫斯鲍尔(Mössbauer) 光谱学。莫斯鲍尔光谱学表明化合物1中的Fe中心大部分处于被俘获的混合价+2和+3氧化作用根据该状态可以计算出HPO 4和哌嗪鎓上质子氢的平均占有率为0.8。在4 K时,部分Fe 2+和Fe 3+原子之间存在间隔隧穿过程。化合物1包含角共享FeO 4 }和PO 4 }四面体的线性链。Fe原子通过Fe – O – P – O – Fe和Fe – O – Fe键连接。这些链通过涉及哌嗪鎓和苯并the的氢键相互作用而保持在一起。水 的分子 结晶以及HPO 4基团之间的互补H键。这磷酸铁