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Related Concept Videos

Complexometric Titration: Ligands00:43

Complexometric 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...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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Related Experiment Video

Updated: Jan 13, 2026

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

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Multivalent ligands regulate dimensional engineering for inverted perovskite solar modules.

Xiaoming Chang1, Yanping Liu2, Yue Ping1

  • 1KAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia.

Science (New York, N.Y.)
|January 8, 2026
PubMed
Summary
This summary is machine-generated.

Multivalent amidinium ligands control perovskite structure, enhancing solar cell performance and stability. This structural transition improves defect passivation and energy alignment for efficient power conversion.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Solid-State Chemistry

Background:

  • Conventional monovalent ammonium ligands in low-dimensional perovskites exhibit limitations in chemical coordination and deprotonation.
  • Multivalent, resonance-stabilized amidinium ligands offer improved properties for perovskite applications.

Purpose of the Study:

  • To introduce a strategy for controlling the structural transition from one-dimensional (1D) to two-dimensional (2D) amidinium perovskites.
  • To elucidate the relationship between molecular structure, interfacial interactions, and resulting dimensionality.
  • To optimize interfacial properties for enhanced solar cell performance.

Main Methods:

  • Systematic tuning of ligand conformation to modulate hydrogen bonding, π-π stacking, and basicity.
  • Investigating the impact of 1D and 2D amidinium perovskite structures on surface coverage and defect passivation.
  • Fabricating and characterizing inverted 3D/2D-amidinium perovskite solar cells.

Main Results:

  • The 1D-amidinium perovskite structure shows geometric anisotropy, hindering uniform surface coverage and defect passivation.
  • The 2D-amidinium perovskite forms a continuous, homogeneous interfacial layer, leading to effective defect passivation and favorable energy-level alignment.
  • Optimized 3D/2D-amidinium perovskite solar cells achieved 25.4% power conversion efficiency and maintained over 95% initial efficiency after 1100 hours of operation at 85°C.

Conclusions:

  • Controllable 1D-to-2D structural transition of amidinium ligands is crucial for optimizing perovskite solar cell performance.
  • The 2D-amidinium perovskite structure provides superior interfacial properties for defect passivation and energy alignment.
  • This strategy enables highly efficient and stable perovskite solar cells.