[(CO)₅CrTlCr(CO)₅]⁻, der erste Komplex mit linear zweifach koordiniertem Thallium

Abstract

Angel.,. C h m . 1993, 105. A7r. I 2 Q VCH I'erlirgs~~~~NsiIiaft nibli, 0-69451 Weinherm, 1993 Oo44-a249:.93jl212-184~ S fO.OO+ ,2510

Four-Coordinate Group-14 Elements in the Formal Oxidation State of Zero – Syntheses, Structures, and Dynamics of [{(CO)5Cr}2Sn(L2)] and Related Species

“…An explanation for this trend based on the clusion that the LUMO is ligand centered in each case. While the reduction is thus ligand-centered the oxidation different π-donor capabilities of [CpЈ(CO) 2 Mn] versus [(CO) 5 Cr] has already been given above. Yet another trend of the compounds 1aϪ3b appears to be metal-centered: independent of the ligand but slightly dependent on the metal is seen when comparing the data collected in Tables 5 and 7: the MϪEϪM angle systematically increases along the the oxidation waves are observed in the range of 0.7Ϫ1.0 V.…”

“…2,2Ј-Bipyridine or 1,10- , are prepared from definitely stable at room temperature under an inert atmosphere [4] . When, however, these salts are metathesized with [Ph 4 P] 2 [{(CO) 5 Figure 2. Carbonyl region of the IR-absorption spectra of as described [4] .…”

“…The resulting anion [{(CO) 5 [1] and Sn 0 ) with two coordination positions occupied by the [{(CO) 5 Cr} 6 Sn 6 ] 2Ϫ [2] are well characterized species. In order anionic chelate ligand [4] .…”

“…Chromatographic workup, separating compounds 1 from the decomposition products [M(CO) 6 ], [M(CO) 4 (bipy)], and [M(CO) 4 (phen)], respectively, leads to 1aϪ1f in yields [5] and [{CpЈ(CO) 2 Mn} 2 Sn-(phen)] [6] . The IR-ν CO spectra of 1aϪ1f show the three-band pat-…”

“…the [CpЈ(CO) 2 Mn] analogues of compounds 1 [5] [6] . This 2b [n] 9.71 [l] 8.44 [m] 9.68 [l] Ϫ Ϫ 2c [n] 9.74 [l] 8.39 [m] 9.64 [l] Ϫ indicates that the coordination of the chelate ligands is somewhat stronger for 1aϪ1f as compared to their [ [10] are available as such.…”