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ARS Home » Southeast Area » New Orleans, Louisiana » Southern Regional Research Center » Cotton Chemistry and Utilization Research » Research » Publications at this Location » Publication #175435
Title: SYNTHESIS OF BIMETALLIC FULVALENE AND BIS (CYCLOPENTADIENYL) METHANE DERIVATIVES OF NIOBIUM AND TANTALUM TETRACARBONYL

Author
item Gallagher, Skip
item BITTERWOLF, THOMAS - DEPT OF CHEM,UNV OF IDAHO
item RHEINGOLD, ARNOLD - DEPT. OF CHEM, UNV OF CAL
item GUZEI, A - DEPT. OF CHEM, UNV OF DEL
item LIABLE-SANDS, L. - DEPT. OF CHEM, UNV OF DEL

Submitted to: Elsevier
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/16/2004
Publication Date: 10/28/2004
Citation: Gallagher, S., Bitterwolf, T.E., Rheingold, A.L., Guzei, A.I., Liable-Sands, L. 2005. Synthesis of bimetallic fulvalene and bis (cyclopentadienyl) methane derivatives of niobium and tantalum tetracarbonyl. Elsevier. Inorganica Chimica Acta. 358:449-451.

Interpretive Summary: Several novel compounds containing the transition metals niobium or tantalum have been synthesized. The compounds are ideal catalysts, with labile carbon monoxides capable of opening two coordination sites on the metal. The first vacated site is used to bind a polymer chain and the second available site binds a monomer for addition to the growing polymer chain end. These organometallic compounds of niobium and tantalum have been crystallized and their structures determined. Incorporation of Group V catalysts onto a high surface area substrate, such as cotton, would permit the removal and recycling of the rather expensive catalyst from the resulting polymerization of a polyolefin such as polyethylene.

Technical Abstract: Ring coupled bimetallic derivatives (mu-eta5:5- C5H4C5H4)[Nb(CO)4]2 and [mu-CH2(eta5- C5H4)2][M(CO)4]2, where M is Nb or Ta have been prepared. The molecular structures of the latter two compounds have been determined: [mu-CH2(05- C5H4)2][Nb(CO)4]2•½ C6H6, triclinic, P', a = 8.028(2) Å, b = 11.414(1) Å, c = 12.711(2) Å, gamma = 75.020(8)o, beta = 80.34(2)o, alpha = 79.46(2)o, V = 1097.3(4) Å3, Z = 2, R(F) = 2.79%; [mu-CH2(05- C5H4)2][Ta(CO)4]2, triclinic, P', a = 7.815(3) Å, b = 10.275(4) Å, c = 13.135(4) Å, gamma = 104.25(3)o, beta = 100.26(4)o, alpha = 96.86(3)o, V = 991.2(6) Å3, Z = 2, R(F) = 3.00%.