TY - JOUR
T1 - Synthesis, characterisation and properties of platinum(II) acetylide complexes of ferrocenylfluorene
T2 - Novel soluble donor-acceptor heterometallic materials
AU - Wong, Wai Yeung
AU - Wong, Wai Kwok
AU - Raithby, Paul R.
PY - 1998/8/21
Y1 - 1998/8/21
N2 - Two new bis(acetylide)-functionalised ferrocenylfluorene complexes, 9-ferrocenylmethylene-2,7-bis-(trimethylsilylethynyl)fluorene 1 and -2,7-bis(ethynyl)fluorene 2, have been prepared in good yield by condensation of ferrocenecarbaldehyde with 2,7-bis(trimethylsilylethynyl)fluorene and the subsequent desilylation of 1. Treatment of trans-[PtPh(Cl)(PEt3)2] with half an equivalent of 2 in CH2Cl2-NHPri2, in the presence of CuI, at room temperature, gives the dimeric platinum(II) complex trans-[Ph(Et3P)2-Pt-C≡CRC≡C-Pt(PEt 3)2Ph] 3 (R = 9-ferrocenylmethylenefluorene-2,7-diyl) in 56% yield. Soluble polymeric trans-[{-Pt(PBun3)2-C≡CRC≡C-} n] 4 has been obtained in good yield by the CuI-catalysed dehydrohalogenation of trans-[Pt(PBun3)2Cl2] with 2 (1:1 molar ratio) in an amine solvent. Optical measurements on the thin films indicated that there is a significant reduction in the bandgap value for polymer 4 (2.1 eV) as compared to that of trans-[{-Pt(PBun3)2-C≡CRC≡C-} n] 5 (R = fluorene-2,7-diyl) (2.9 eV) without the ferrocenyl moiety, featuring the importance of donor-acceptor interaction in such conjugated systems. All the new compounds have been characterised by analytical, spectroscopic and electrochemical methods, and the single-crystal structures of 2, 3 and 5 have been established.
AB - Two new bis(acetylide)-functionalised ferrocenylfluorene complexes, 9-ferrocenylmethylene-2,7-bis-(trimethylsilylethynyl)fluorene 1 and -2,7-bis(ethynyl)fluorene 2, have been prepared in good yield by condensation of ferrocenecarbaldehyde with 2,7-bis(trimethylsilylethynyl)fluorene and the subsequent desilylation of 1. Treatment of trans-[PtPh(Cl)(PEt3)2] with half an equivalent of 2 in CH2Cl2-NHPri2, in the presence of CuI, at room temperature, gives the dimeric platinum(II) complex trans-[Ph(Et3P)2-Pt-C≡CRC≡C-Pt(PEt 3)2Ph] 3 (R = 9-ferrocenylmethylenefluorene-2,7-diyl) in 56% yield. Soluble polymeric trans-[{-Pt(PBun3)2-C≡CRC≡C-} n] 4 has been obtained in good yield by the CuI-catalysed dehydrohalogenation of trans-[Pt(PBun3)2Cl2] with 2 (1:1 molar ratio) in an amine solvent. Optical measurements on the thin films indicated that there is a significant reduction in the bandgap value for polymer 4 (2.1 eV) as compared to that of trans-[{-Pt(PBun3)2-C≡CRC≡C-} n] 5 (R = fluorene-2,7-diyl) (2.9 eV) without the ferrocenyl moiety, featuring the importance of donor-acceptor interaction in such conjugated systems. All the new compounds have been characterised by analytical, spectroscopic and electrochemical methods, and the single-crystal structures of 2, 3 and 5 have been established.
UR - http://www.scopus.com/inward/record.url?scp=33748515456&partnerID=8YFLogxK
U2 - 10.1039/a803168a
DO - 10.1039/a803168a
M3 - Article
AN - SCOPUS:33748515456
SN - 0300-9246
SP - 2761
EP - 2766
JO - Journal of the Chemical Society - Dalton Transactions
JF - Journal of the Chemical Society - Dalton Transactions
IS - 16
ER -