- Macromolecular Self-Assembly of Organotin(IV) Squarates and Croconates – Preparation and Crystal Structures of [SnMe2(H2O)2]C4O4, [SnMe3]2C4O4, and [SnMe3(H2O)]2C5O5
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The new organotin(IV) squarates and croconates [SnMe2(H2O)2]C4O4 (1), [SnMe3]2C4O4 (2), and [SnMe3(H2O)]2C5O5 (3), were prepared by salt metathesis from the appropriate sodium salts, and characterized by single-crystal X-ray diffraction and infrared spectroscopy. While 1 and 2 are coordination polymers with bridging C4O42– anions, compound 3 exists as a monomer in the solid state. In the hydrated compounds 1 and 3, the molecules are interconnected by various types of O–H···O bridges between non-coordinated carbonyl oxygen atoms and water ligands, resulting in a supramolecular layer (1, 2) or network structure (3), respectively.
- Liebing, Phil,Husien, Asrial A.,Fischer, Axel,Nietzschmann, Eckhart,Edelmann, Frank T.
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- Croconic acid and alkali metal croconate salts: Some new insights into an old story
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The solid-state structures of a series of alkali metal salts of the croconate dianion (C5O52-) and of croconic acid (H2C5O5) have been determined. The alkali metal croconates were obtained
- Braga, Dario,Maini, Lucia,Grepioni, Fabrizia
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- Oxocarbon Salts for Fast Rechargeable Batteries
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Oxocarbon salts (M2(CO)n) prepared through one-pot proton exchange reactions with different metal ions (M=Li, Na, K) and frameworks (n=4, 5, 6) have been rationally designed and used as electrodes in rechargeable Li, Na, and K-ion batteries. The results show that M2(CO)5/M2(CO)6salts can insert two or four metal ions reversibly, while M2(CO)4shows less electrochemical activity. Especially, we discover that the K2C6O6electrode enables ultrafast potassium-ion insertion/extraction with 212 mA h g?1at 0.2 C and 164 mA h g?1at 10 C. This behavior can be ascribed to the natural semiconductor property of K2C6O6with a narrow band gap close to 0.9 eV, the high ionic conductivity of the K-ion electrolyte, and the facilitated K-ion diffusion process. Moreover, a first example of a K-ion battery with a rocking-chair reaction mechanism of K2C6O6as cathode and K4C6O6as anode is introduced, displaying an operation voltage of 1.1 V and an energy density of 35 Wh kg?1. This work provides an interesting strategy for constructing rapid K-ion batteries with renewable and abundant potassium materials.
- Zhao, Qing,Wang, Jianbin,Lu, Yong,Li, Yixin,Liang, Guangxin,Chen, Jun
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supporting information
p. 12528 - 12532
(2016/10/13)
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- Process for producing croconic acid or salt thereof
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Croconic acid or a salt thereof is easily produced at low cost by a reaction of a hydrocarbon compound consisting of a five-membered ring or a hydrocarbon compound consisting of a five-membered ring having an oxo group and/or a monovalent group linked via an oxygen atom with a halogenating agent.
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Page/Page column 4
(2008/06/13)
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