Dianion - Wikipedia
A dianion is an anion with a net charge of −2. While there exist many stable molecular dianions, such as BeF 4 2− and MgF 4 2− , [ 1 ] thus far no stable atomic dianion has been found: Electron shielding and other quantum mechanical effects tend to make the addition of another electron to an atomic anion unstable.
鲁米诺反应 - 百度百科
鲁米诺 （luminol），又名 发光氨，英文名5-Amino-2,3-dihydro-1,4-phthalazinedione。 它常温下是一种黄色 晶体 或者 米黄色 粉末，是一种比较稳定的化学试剂。 它的化学式是C8H7N3O2。 同时，鲁米诺又是一种强酸，对眼睛、皮肤、 呼吸道 有一定 刺激作用。 法医学 上，鲁米诺反应又叫氨基苯二酰-肼反应，可以鉴别经过擦洗，时间很久以前的血痕。 生物学上则使用鲁米诺来 检测细胞 中的铜、铁及 氰化物 的存在。 鲁米诺在1853年被合成出来。 1928年，化学家首次发现这 …
Cations and Anions: Definitions, Examples, and Differences
2020年3月3日 · An ion with a -2 charge is an anion that is also called a dianion. An ion with a +2 charge is a cation that is also called a dication. A neutral molecule that has an area of positive charge and an area of negative charge is called a zwitterion .
The anti-aromatic dianion and aromatic tetraanion of …
2024年3月6日 · Molecules with circuits of 4n + 2 π electrons, such as [18]annulene (n = 4), are aromatic, with enhanced stability and diatropic ring currents (magnetic shielding inside the ring), whereas those ...
Diethynylbenzene dianion - Wikipedia
In organic chemistry, a diethynylbenzene dianion is an anion consisting of two ethynyl anions as substituents on a benzene ring. With the chemical formula C 6 H 4 C 2− 4, three positional isomers are possible, differing in the relative positions of the two substituents around the ring: ortho-diethynylbenzene dianion; meta-diethynylbenzene dianion
Isolation of a triplet benzene dianion | Nature Chemistry
2021年7月19日 · Here, we show that the elusive benzene diradical dianion can be stabilized through creation of a binucleating ligand that enforces a tightly constrained inverse sandwich structure and direct...
Definition of dianions - Chemistry Dictionary
Molecular entities bearing two negative charges, which may be located on a single atom or on different atoms or may be delocalized.
Photophysics of Perylene Diimide Dianions and Their …
Perylene diimides (PDIs) are an important class of organic dyes, which have been explored extensively in their native (charge-neutral) forms. 1 Recently, there has been significant interest in photochemical applications of the one-electron reduced (monoanion) forms of PDIs, whereas the two-fold reduced (dianion) PDI species have attracted less ...
Cyclization Reactions of Dianions in Organic Synthesis
Taming Highly Unstable Radical Anions and 1,4-Organodilithiums by Flow Microreactors: Controlled Reductive Dimerization of Styrenes. JACS Au2022, 2 (11) , 2514-2521. https://doi.org/10.1021/jacsau.2c00375.
dianion - Wiktionary, the free dictionary
2024年8月19日 · This page was last edited on 19 August 2024, at 03:17. Definitions and other text are available under the Creative Commons Attribution-ShareAlike License; additional ...
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