SYNTHESIS AND CHARACTERIZATION OF MONOMERIC, DIMERIC AND POLYMERIC FERROCENYLACETYLIDES - CRYSTAL-STRUCTURE OF 1,1'-BIS(PHENYLETHYNYL)FERROCENE - INGHAM, SL; KHAN, MS; LEWIS, J; LONG, NJ; RAITHBY, PR (JOURNAL OF ORGANOMETALLIC CHEMISTRY, 1994)