Author
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Gallagher, Skip |
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BITTERWOLF, THOMAS - DEPT OF CHEM,UNV OF IDAHO |
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RHEINGOLD, ARNOLD - DEPT. OF CHEM, UNV OF CAL |
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GUZEI, A - DEPT. OF CHEM, UNV OF DEL |
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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%. |