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Structural and electronic properties in asymmetric binuclear Zn(II) amphiphilic compounds
Journal of Coordination Chemistry ( IF 2.2 ) Pub Date : 2020-02-16 , DOI: 10.1080/00958972.2020.1737325
Sara Realista 1 , Bárbara Oliveira 1 , Joana Aldeias 1 , Vanesa Fernández-Moreira 2 , M. Concepción Gimeno 2 , Ana S. Viana 3 , Maria José Calhorda 1 , Paulo N. Martinho 1
Affiliation  

Abstract A new type of asymmetric binuclear Zn(II) complex was synthesized from a suitable mononuclear precursor. One Zn(II) was coordinated to a salphen ligand (salphen = N,N′-disalicylidene-1,2-phenylenediamine) and the other to a modified salphen bearing OC12H25 chain in the 4,4’ positions, the two being joined by phenylene rings. The molecular structure, determined by DFT calculations (ADF/BP86(COSMO:THF)/TZ2P), showed the non-planarity of each of the two complexes, the dihedral angle at the junction being ∼36°. The absorption spectra of 2 and its precursor 1 in DMSO showed a strong band in the visible at 427 and 408 nm, respectively, assigned based on TDDFT calculations mainly to intra- and interligand π→π* transitions. Complex 2 displayed emission at 531 nm in DMSO and 534 nm in other solvents. The long alkyl chain of its substituents promoted self-assembly of these amphiphilic molecules. No gels were formed in DMSO, but several bands (420, 418 and 480 nm) and shoulders appeared in other solvents, and gels were detected when increasing concentration. The formation of aggregates was studied by scanning electron microscopy and atomic force microscopy, and the images found in the three solvents reflected different supramolecular arrangements. These studies revealed that the binuclear compound formed stable gels above 8.88 mM for tetrahydrofuran and 13.3 mM for toluene and chloroform. Graphical Abstract

中文翻译:

不对称双核 Zn(II) 两亲化合物的结构和电子特性

摘要 以合适的单核前驱体为原料合成了一种新型的不对称双核Zn(II)配合物。一个 Zn(II) 与 salphen 配体(salphen = N,N'-disalicylidene-1,2-苯二胺)配位,另一个与在 4,4' 位置带有 OC12H25 链的修饰的 Salphen 配位,两者通过亚苯基环。通过 DFT 计算 (ADF/BP86(COSMO:THF)/TZ2P) 确定的分子结构表明,这两种配合物均具有非平面性,交界处的二面角约为 36°。2 及其前体 1 在 DMSO 中的吸收光谱分别在 427 和 408 nm 处显示出可见的强带,基于 TDDFT 计算主要分配给配体内和配体间 π→π* 跃迁。复合物 2 在 DMSO 中的发射波长为 531 nm,在其他溶剂中为 534 nm。其取代基的长烷基链促进了这些两亲分子的自组装。在 DMSO 中没有形成凝胶,但在其他溶剂中出现了几个条带(420、418 和 480 nm)和肩峰,并且在增加浓度时检测到凝胶。通过扫描电子显微镜和原子力显微镜研究聚集体的形成,在三种溶剂中发现的图像反映了不同的超分子排列。这些研究表明,双核化合物在四氢呋喃的 8.88 mM 以上和甲苯和氯仿的 13.3 mM 以上形成稳定的凝胶。图形概要 通过扫描电子显微镜和原子力显微镜研究聚集体的形成,在三种溶剂中发现的图像反映了不同的超分子排列。这些研究表明,双核化合物在四氢呋喃 8.88 mM 以上和甲苯和氯仿 13.3 mM 以上形成稳定凝胶。图形概要 通过扫描电子显微镜和原子力显微镜研究聚集体的形成,在三种溶剂中发现的图像反映了不同的超分子排列。这些研究表明,双核化合物在四氢呋喃的 8.88 mM 以上和甲苯和氯仿的 13.3 mM 以上形成稳定的凝胶。图形概要
更新日期:2020-02-16
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