292143-00-1

Basic information

• Product Name: [Cr₂(acetato)2(N,N'-bis(2,6-xylyl)formamidinate)2(THF)2]
• CAS NO: 292143-00-1
• Molecular Weight: 868.998
• Mol File: 292143-00-1.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: [Cr₂(acetato)2(N,N'-bis(2,6-xylyl)formamidinate)2(THF)2](CAS DataBase Reference)
• NIST Chemistry Reference: [Cr₂(acetato)2(N,N'-bis(2,6-xylyl)formamidinate)2(THF)2](292143-00-1)
• EPA Substance Registry System: [Cr₂(acetato)2(N,N'-bis(2,6-xylyl)formamidinate)2(THF)2](292143-00-1)

Safety Data

• Hazardous Substances Data: 292143-00-1(Hazardous Substances Data)

Upstream product

• 292142-99-5 [Cr2(N,N'-bis(2,6-xylyl)formamidinate)2(μ-Cl)2(THF)2] 
• 127-09-3 sodium acetate 
• 16596-05-7 N,N'-bis-2,6-xylylformamidine 
• 628-52-4 chromium(II) acetate 

Relevant articles and documents

Chromium(II) complexes bearing 2,6-substituted N,N′-diarylformamidinate ligands

The synthesis, isolation and characterisation of several new chromium(II) complexes of the N,N′-bis(2,6-xylyl)-formamidinate ligand (DXylF) has been undertaken. The structure of three such complexes, namely Cr(DXylF)2, 1, Cr2(μ-Cl)2(DXylF)2(THF)2, 2, and Cr2(Ac)2(DXylF)2(THF)2,3, have been determined by X-ray crystallography. It has been shown that the steric demands of the 2,6-xylyl group effectively discourage the formation of the homoleptic paddlewheel structure Cr2(DXylF)4: instead, the mononuclear (but stoichiometrically equivalent) complex Cr(DXylF)2, 1 was obtained. It is likely that the unusual dichromium dichloride-bridged intermediate 2 also owes its stability to the presence of such bulky substituents. Although this complex does not possess a significant metal-metal bonding interaction [Cr-Cr = 2.612(1) A], it has however, proven to be a useful starting material for the preparation of the novel quadruply bonded dichromium mixed acetate-formamidinate complex 3 [Cr-Cr (avg) = 2.339(7) A]. In both 2 and 3, the 2,6-xylyl groups force the formamidinate ligands to oppose one another contrary to the trans effect. In addition, it was found that compound 3 can be accessed from the chromium acetate starting material and, for comparison, an attempt was also made to prepare the N,N′-bis(o-anisyl)formamidinate (DPhOMeF) analogue. With the formamidinates occupying positions cis to one another and with the absence of axially coordinated THF ligands, the molecular structure of the resultant Cr2(Ac)2(DPhOMeF)2,4 [Cr-Cr = 2.037(1) A], is different from that of 3. The Royal Society of Chemistry 2000.