Carbonylkomplexe von Chrom, Molybdän und Wolfram mit 2.2′‐Biimidazol und 5.5′‐Bitriazol

Abstract

Die Darstellung der Tetracarbonylkomplexe (HLLH)M(CO)4, [(LL)M(CO)4]2− und [(OC)4M(LL)M″(CO)4]2− (M,M″ = Cr, Mo, W; LL = Dianion von 2.2′ Bimidazol, 5.5′‐Bitriazol) wird beschrieben. Nach den υ (C0)‐Banden sind die beiden Azolringe in den zweikernigen Komplexen nicht koplanar.

Biimidazole and Bis(amide)bipyridine Molybdenum Carbonyl Complexes as Anions Receptors

“…All manipulations were carried out under a nitrogen atmosphere using Schlenk techniques. Compound 2 was prepared as previously reported . Tetrabutylammonium salts were purchased from Fluka or Aldrich.…”

Nitrogen‐Rich Compounds of the Lanthanoids: The 5,5′‐Azobis[1H‐tetrazol‐1‐ides] of the Light Rare Earths (Ce, Pr, Nd, Sm, Eu, Gd)

“…N-Rich heterocycles such as tetrazoles are of interest in coordination chemistry. Due to their extremely low-lying p*-orbtials, they are excellent p-acceptors [6] [7]. Such compounds have the potential to serve with their electrochemical or optical properties, in particular as electronic devices [8 -10].…”

Syntheses and structure of molybdenum(O) dimers based on tetracyanobiimidazole

“…This indicates that the tetracyanobiimidazole dianion is nearly as effective a pi acceptor as the phosphine. This is further corroborated by the CO stretching frequencies in the carbonyl anion which average 20 cm-' higher than those of corresponding unsubstituted biimidazole complex [7]. Thus tetracyanobiimidazole can be expected to readily bridge low valent metals and to form the basis for a wide variety of organometallic dimers.…”

“…We have also demonstrated the bridging of Cu(I) ions by Tcbiim'-and we are investigating this system further [6]. Beck and coworkers were able to form dimers of zero-valent molybdenum using biiiidazole [7] and we report here some analogous compounds based on HzTcbiim. The unique properties of the percyano substituted imidazole make these compounds easier to prepare and somewhat more tractable.…”