DFT和TDDFT研究用于铜传感的π结合联体:分析电子结构和光学性能
Susheel1, Abdullah Saad Alsubaie2, Mukhtar Ahmed1
1Department of Chemistry, Central University of Haryana, Mahendergarh, Haryana, 123031, India.
Journal of molecular modeling
|October 22, 2025
概括
密度函数理论研究了基于素的配体和铜复合体,揭示了L3-Cu2+由于其稳定性和光学特性,对金属离子传感器具有前景. 这项理论研究支持了对铜离子检测的实验发现.
科学领域:
- 计算化学计算化学
- 材料科学 材料科学 材料科学
- 频谱学是一种光谱学.
背景情况:
- 研究 π 结合的林基联体 (L1-L4) 和其铜 (Cu2+) 复合物的结构,结合和光学特性.
- 用密度函数理论 (DFT) 和时间依赖 DFT (TDDFT) 进行全面分析.
研究的目的:
- 探索基于氨酸的配体及其铜复合物的潜力,用于金属离子传感中的应用.
- 阐明这些系统的电子结构,粘合特性和光学行为.
主要方法:
- 用于几何优化和频率分析的DFT (非金属的B3LYP/6-311G(d,p,铜的LANL2DZ).
- 用极化连续模型来求解.
- 应用自然结合轨道 (NBO) 分析用于结合性质和稳定能.
- 使用TDDFT (ORCA4.2) 模拟吸收光谱,并进行拓分析 (Multiwfn,VMD).
主要成果:
- L3联体表现出最低的HOMO-LUMO间隙 (3.05 eV),其Cu2+复合体 (2.52 eV) 显著减少,表明增强的电荷传输.
- 对于L3-Cu2+,NBO分析显示了高稳定能量 (79.15 kcal/mol),证实了强烈的捐赠者-受体相互作用.
- TDDFT揭示了L3-Cu2+在452nm和667nm的强烈的联体到金属电荷转移带.
- 非线性光学分析表明,铜复合体,特别是L1-Cu2+和L4-Cu2+中增强的超极化性.
结论:
- L3-Cu2+复合体表现出良好的稳定性和光学性能,使其成为开发选择性铜离子传感器的强有力的候选者.
- 理论发现与实验观察结果一致,验证了基于L3的系统在铜离子检测应用中的潜力.
- 该研究为设计具有改进光学响应的新型金属离子传感器提供了理论框架.
相关概念视频
02:58Crystal Field Theory - Octahedral Complexes
30.6K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.6K
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
48.1K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
48.1K
03:02Colors and Magnetism
13.9K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
13.9K
02:42Valence Bond Theory
11.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.2K
00:43Complexometric Titration: Ligands
2.2K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.2K
02:51Metal-Ligand Bonds
23.9K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
23.9K