15668-63-0

Upstream product

• 366-18-7 [2,2]bipyridinyl 
• 15616-67-8 2Na⁽¹⁺⁾*Cr₂(CO)10^(2-)=Na₂[Cr₂(CO)10] 
• 2001-45-8 tetraphenyl phosphonium chloride 

Downstream Products

• 21240-17-5 Cr(CO)3P(C₆H₅)3(C₅H₄N)2 
• 15492-74-7 cis(CO)3Cr(2,2'-bipyridyl)(triphenylphosphine) 
• 15489-58-4 trans-(CO)2Cr(2.2'-bipyridyl)(P(C₆H₅)3)2 
• 1314914-68-5 cis-[Cr(CO)4(PPh(N(CH₂C₆H₅)2)2)2] 
• 15489-58-4 trans-(CO)2Cr(2.2'-bipyridyl)(P(C₆H₅)3)2 

Relevant academic research and scientific papers

[{(CO)5Cr}6Ge6]2-, a molecular organometallic derivative of the unknown zintl ion [Ge6]2-

Octahedral clusters from p-block elements are rare; however, the only known molecular aggregate of this kind, [{(CO)5Cr}6Sn6]2-, has now been supplemented by the isoetectronic cluster [{(CO)5Cr}6Ge6]2-(1).

Four-coordinate group-14 elements in the formal oxidation state of zero - Syntheses, structures, and dynamics of [{(CO)5Cr}2Sn(L2)] and related species

The sodium salts Na2[{(CO)5M}2EX2] (M = Cr, Mo, W; E = Ge, Sn, Pb; X = Cl, I, OOCCH3) react with 2,2′-bipyridine (bipy) to form neutral compounds [{(CO)5M}2E(bipy)] (E = Sn: 1a-1c; E = Ge: 3a; E = Pb: 4). 1,10-Phenanthroline (phen) analogues of compounds 1a-1c and 3a [{(CO)5M}2E(phen)] (E = Sn: 1d-1f, E = Ge: 3b) are as well accessible. The 2,2′-bipyridine ligand in 1 may be formally replaced by two pyridine (py) ligands resulting in [{(CO)5M}2Sn(py)2] (1g: M = Cr, 1h: M = W). The bis-bidentate ligand 2,2′-bipyrimidine (bpmd) is found to coordinate just one [{(CO)5M}2Sn] entity in [{(CO)5M}2Sn(bpmd)] (2b: M = Cr, 2c: M = W). The biimidazolato (biim) ligand binds two [{(CO)5Cr}2Sn] moieties in [{(CO)5Cr}2Sn(biim)Sn{Cr(CO)5} 2]2-, 2a. It is shown by 1H-NMR that the pyrimidine entities in these compounds (2b, 2c) are able to rotate by a full 180° turnaround with respect to one another. This process must involve complete de-coordination of at least one of the two nitrogen donors in again at least one of the chelate cycles, the activation energy for this process being around 60 kJ/ mol. By 119Sn-NMR spectroscopy of almost all of the tin compounds described it is shown that equilibria between [{(CO)5M}2Sn(L2)] and [{(CO)5M}2Sn(L)] + L exist in all cases. From the temperature dependence of the δ values it is concluded that the activation barriers for this association/ dissociation process is below 10 kJ/mol. The structures of all new compounds are documented by X-ray analyses and all compounds are characterized by the usual analytical and spectroscopical techniques.