Preparation and Characterization of the Argentates: Ag?P(CF3)2!2(-), Ag?(mu-P(CF3)2)M(CO)5!2(-) (M = Cr, W) and Ag?mu-P(C6F5)2)W(CO)5!2(-): X-Ray Crystal Structure of K(18-Crown-6)Ag?mu-P(CF3)2)Cr(CO)5!2
Abstract
The novel bis?bis(trifluoromethyl)phosphanido !argentate, Ag(P(CF3)2!2(-), is obtained via the reaction of HP(CF3)2 with Ag(CN)2(-) and isolated as its K(18-crown-6) salt. If the cyclic phosphane (PCF3)4 is reacted with a slight excess of K(18-crown-6)Ag?P(CF3)2!2 a selective insertion of one PCF3 unit into each silver phosphorus bond is observed, giving NMR spectroscopic evidence for the Ag?P(CF3)P(CF3)2!2(-) ion. On treatment of the phosphane complexes M(CO)5PH(CF3)2 (M= Cr, W) with K(18- crown-6)Ag(CN)2 the formation of the comparable trinuclear argentates, Ag?(mu P(CF3)2)M(CO)5!2(-) is achieved. The chromium compound K( 18-crown-6) Ag((mu P(CF3)2)Cr(CO)5!2 crystallizes in a non-centrosymmetric space group Fdd2 (no. 43), a = 2970.2(6) pm, b = 1584.5(3) pm, C = 1787.0(4), V = 8.410(3)cu nm, Z= 8. The C2 symmetric anion, Ag?(mu-P(CF3)2)Cr(CO)5!2(-), shows a nearly linear arrangement of the P-Ag-P unit and represents the first example of a structurally characterized perfluorinated phosphanido-metal complex. Although, the bis(pentafluorophenyl)phosphanido compound Ag?P(C6F5)2!2(-) could not be obtained so far, the synthesis of its trinuclear counterpart, K(18-crown-6) Ag ? (mu-P(C6F5)2)W(CO)5! 2! was successful.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 16, 2003
- Accession Number
- ADA416877
Entities
People
- Ashwani Vij
- Berthold Hoge
- Christoph Thoesen
- Tobias Herrmann
Organizations
- Air Force Research Laboratory