Masoud Mamdouh S, Ibrahim Amany A, Khalil Ekram A, El-Marghany Adel
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Jul;67(3-4):662-8. doi: 10.1016/j.saa.2006.07.046. Epub 2006 Aug 25.
The reaction of FeCl(3) with uracil (H(2)L(1)), citrazinic acid (H(2)L(6)), 5-(phenylazo)citrazinic acid (H(2)L(7)), 5-(m-hydroxyphenylazo)citrazinic acid (H(2)L(8)) and 5-(m-nitrophenylazo)citrazinic acid (H(2)L(9)) leads to the formation of complexes with the empirical formula Fe(HL)(3).nH(2)O (n=1-3). All of the prepared complexes have octahedral complexation geometry where the azo group is not the reactive site for complexation. Thiouracil (H(2)L(2)) and the 5-(substituted phenylazo)thiouracil (H(2)L(3)-H(2)L(5)) ligands are bidentates on complexation with Co(II), Ni(II) and Cu(II). The complexes have been characterized by elemental analyses, IR, electronic spectra, magnetic susceptibility, DTA, electron spin resonance (copper complexes) and Mössbauer spectra (iron complexes). The coordination bond lengths between the metal ion and the active centers for complexation were calculated.
氯化铁（FeCl₃）与尿嘧啶（H₂L₁）、柠嗪酸（H₂L₆）、5-（苯基偶氮）柠嗪酸（H₂L₇）、5-（间羟基苯基偶氮）柠嗪酸（H₂L₈）和5-（间硝基苯基偶氮）柠嗪酸（H₂L₉）反应生成经验式为Fe(HL)₃·nH₂O（n = 1 - 3）的配合物。所有制备的配合物都具有八面体配位几何结构，其中偶氮基团不是配位的反应位点。硫脲（H₂L₂）和5-（取代苯基偶氮）硫脲（H₂L₃ - H₂L₅）配体在与Co(II)、Ni(II)和Cu(II)配位时为双齿配体。通过元素分析、红外光谱、电子光谱、磁化率、差热分析、电子自旋共振（铜配合物）和穆斯堡尔光谱（铁配合物）对配合物进行了表征。计算了金属离子与配位活性中心之间的配位键长度。
