Novel Organometallic Building Blocks for Crystal Engineering. Synthesis and Structural Characterization of the Dicarboxylic Acid [Cr0(
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- 作者：Dario Braga ; Lucia Maini ; Fabrizia Grepioni ; Christoph Elschenbroich ; Francesca Paganelli ; and Olav Schiemann
- 刊名：Organometallics
- 出版年：2001
- 出版时间：April 30, 2001
- 年：2001
- 卷：20
- 期：9
- 页码：1875 - 1881
- 全文大小：215K
- 年卷期：v.20,no.9(April 30, 2001)
- ISSN：1520-6041
文摘
The synthesis and structural characterization of the neutral diamagnetic organometallicdicarboxylic acid [Cr0(
6-C6H5COOH)2] (1) is reported. Oxidation of 1 by oxygen leads toformation of the paramagnetic dicarboxylic acid cation [CrI(6-C6H5COOH)2]+ (2), which hasbeen isolated as the [PF6]- salt in two crystalline polymorphic modifications, a monoclinicform 
and a triclinic form 
. The neutral zwitterionic form [CrI(6-C6H5COOH)(6-C6H5COO)] (3) has been obtained in a cocrystal with [NH4][PF6] upon treatment of the acid salt[CrI(6-C6H5COOH)2]+[PF6]-with ammonia. The hydrogen bonding interactions establishedby the neutral and cationic acids are discussed and compared with those observed in thezwitterionic form and in the related complexes [FeII(5-C5H4COOH)2] and [CoIII(5-C5H4COOH)2]+[PF6]-.
6-C6H5COOH)2] (1) is reported. Oxidation of 1 by oxygen leads toformation of the paramagnetic dicarboxylic acid cation [CrI(6-C6H5COOH)2]+ (2), which hasbeen isolated as the [PF6]- salt in two crystalline polymorphic modifications, a monoclinicform and a triclinic form . The neutral zwitterionic form [CrI(6-C6H5COOH)(6-C6H5COO)] (3) has been obtained in a cocrystal with [NH4][PF6] upon treatment of the acid salt[CrI(6-C6H5COOH)2]+[PF6]-with ammonia. The hydrogen bonding interactions establishedby the neutral and cationic acids are discussed and compared with those observed in thezwitterionic form and in the related complexes [FeII(5-C5H4COOH)2] and [CoIII(5-C5H4COOH)2]+[PF6]-.