Heteronucleare komplexverbindungen mit metallmetall-bindungen: VI. Kleine heteronucleare Cluster mit Kupfer und HCr(CO) 5-Fragmenten. Die Strukturen von [(itN 2)Cu(μ 3-H)Cr 2(CO) 10], ( N2 = 2 NH 3, bpy, 1,2-Diaminobenzol), [{(py)Cu(μ 3-H)Cr(CO) 5} 2] und [Cu(PPh 3) 3][Cr 2(μ-H)(CO) 10] sowie die Struktur von [Zn(NH 3) 4][Cr 2(μ-H)(CO) 10] 2

Abstract

The first heteronuclear cluster with the Cr 2(μ-H)(CO) 10-fragment, [(NH 3) 2Cu(μ 3-H)Cr 2(CO) 10] ( 1a), is formed by the reaction of ammoniacal cooper(I) chloride solution with Na[Cr 2(μ-H)(CO) 10]. [(bpy)Cu(μ 3-H)Cr 2(CO) 10] ( 1b) and [(C 6H 8N 2)Cu(μ 3-H)Cr 2(CO) 10] ( 1c) are formed by ligand substitution reactions from 1a as starting compound. A fragmentation reaction of 1a, which is induced by the addition of pyridine, yields the tetranuclear cluster [{(py)Cu(μ 3-H)Cr(CO) 5} 2] ( 3). Cleavage of 1a is also observed by addition of PPh 3, the reaction product is the ionic compound [Cu(PPh 3) 3][Cr 2(μ-H)(CO) 10] ( 4). The CrCr-Distance in ionic compounds such as 4 is correlated with the conformation of the anion; in the staggered anions of 4 the smallest distance is found. [Zn(NH 3) 4][Cr 2(μ-H)(CO) 10] 2 ( 5) is formed by the reaction of ammonical zinc chloride solution with Na[Cr 2(μ-H)(CO) 10]. The crystal structures of all new compounds are reported.