Pt · Pt と π-π スタッキング相互作用によるプラチナ (((II) ベースのホスト-ゲスト調整駆動の超分子共組:カチオンとアニオンのための二重選択発光センサー
Yip-Sang Wong1, Maggie Ng1, Margaret Ching-Lam Yeung1
1Institute of Molecular Functional Materials, State Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China.
Journal of the American Chemical Society
|January 6, 2021
まとめ
新しいプラチナ複合体は 亜鉛イオンとパイロフォスファートアニオンを検出する 二重探査機として機能します これによって 独特のナノファイバーが形成され 化学センサーの進歩が期待されます
科学分野:
- 超分子化学
- 協調化学
- 材料科学
背景:
- イオン検出のための選択的探査機の開発は,化学的および生物学的センシングに不可欠です.
- ディピコイラミン (DPA) 含有アルキニルプラチナ (II) テルピリジン複合体は,センシングアプリケーションの可能性を秘めている.
- 超分子自己組み立ては ナノファイバーのような新しい機能的な材料につながります
研究 の 目的:
- アルキニルプラチナを含むカチオンのDPAを合成し,特徴づけること.
- カチオンとアニオンのための二重選択的探査機としての複合体の能力を調査する.
- 金属結合複合体の自己組み立て行動と 超分子構造を作る可能性を探求する.
主な方法:
- プラチナ (II) 複合体の合成と特徴付け
- 結合現象をモニタリングするためのスペクトル検査 (UVによる吸収,放射)
- 構造の解明のために,スペクトロメトリック研究 (HR-ESI質量スペクトロメトリー,NMR).
- 構造分析と相識別のための分子モデリングと粉末X線微分法 (PXRD).
主要な成果:
- 合成された複合体は,亜鉛イオン (Zn2+) に選択的に結合する.
- 亜鉛結合複合体は,二次認識イベントとして作用するピロフォスファート (PPi) アニオンを認識する.
- ピロフォスファートは2つの亜鉛結合複合体を橋渡しし,クリップ状の構造を開始します.
- これらの構造はさらにPt-Ptとπ-πのスタッキング相互作用によってオリゴメリ化し,六角形の柱状ナノファイバーを形成する.
結論:
- 多機能プラチナ (II) 複合体は,Zn2+とPPiの二重選択性プローブとして機能する.
- 認識イベントは,六角柱状の相を持つナノファイバーの自己組み立てを誘発します.
- この研究は,センシングアプリケーションのための洗練された超分子アーキテクチャの構築におけるこのような複合体の可能性を強調しています.
関連する概念動画
02:42Valence Bond Theory
10.2K
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...
10.2K
01:14Photoluminescence: Applications
747
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
747
02:52Stereoisomerism
13.2K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
13.2K
02:51Metal-Ligand Bonds
22.9K
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...
22.9K
00:43Complexometric Titration: Ligands
1.9K
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...
1.9K
01:22EDTA: Chemistry and Properties
2.8K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
2.8K