Synthesis, characterisation and optical spectroscopy of platinum(ii) di-ynes and poly-ynes incorporating condensed aromatic spacers in the backbone

Muhammad S. Khan, Muna R.A. Al-Mandhary, Mohammed K. Al-Suti, Fathiya R. Al-Battashi, Sultan Al-Saadi, Birte Ahrens, Jens K. Bjernemose, Mary F. Mahon, Paul R. Raithby, Muhammad Younus, Nazia Chawdhury, Anna Köhler, Elizabeth A. Marseglia, Emilio Tedesco, Neil Feeder, Simon J. Teat

Research output: Contribution to journalArticle

Abstract

A series of protected and terminal dialkynes with extended π-conjugation through a condensed aromatic linker unit in the backbone, 1,4-bis(trimethylsilylethynyl)naphthalene, 2a, 1,4-bis(ethynyl)naphthalene, 2b, 9,10-bis(trimethylsilylethynyl)anthracene 3a, 9,10-bis(ethynyl)anthracene 3b, have been synthesized and characterized spectroscopically. The solid-state structures of 2a and 3a have been confirmed by single crystal X-ray diffraction studies. Reaction of two equivalents of the complex trans-[Ph(Et3P)2PtCl] with an equivalent of the terminal dialkynes 1,4-bis(ethynyl)benzene 1b and 2b–3b, in iPr2NH–CH2Cl2, in the presence of CuI, at room temperature, afforded the platinum(ii) di-ynes trans-[Ph(Et3P)2Pt–C≡C–R–C≡C–Pt(PEt3)2Ph] (R = benzene-1,4-diyl 1c; naphthalene-1,4-diyl 2c and anthracene-9,10-diyl 3c) while reactions between equimolar quantities of trans-[(nBu3P)2PtCl2] and 2b–3b under similar conditions readily afforded the platinum(ii) poly-ynes trans-[–(nBu3P)2Pt–C≡C–R–C≡C–]n(R = naphthalene-1,4-diyl 2d and anthracene-9,10-diyl 3d). The Pt(ii) diynes and poly-ynes have been characterized by analytical and spectroscopic methods, and the single crystal X-ray structures of 1c and 2c have been determined. These structures confirm the trans-square planar geometry at the platinum centres and the linear nature of the molecules. The di-ynes and poly-ynes are soluble in organic solvents and readily cast into thin films. Optical spectroscopic measurements reveal that the electron-rich naphthalene and anthracene spacers create strong donor–acceptor interactions between the Pt(ii) centres and conjugated ligands along the rigid backbone of the organometallic polymers. Thermogravimetry shows that the di-ynes possess a somewhat higher thermal stability than the corresponding poly-ynes. Both the Pt(ii) di-ynes and the poly-ynes exhibit increasing thermal stability along the series of spacers from phenylene through naphthalene to anthracene.

Original languageEnglish
Pages (from-to)23772377-23852385
Number of pages80009
JournalJournal of the Chemical Society. Dalton Transactions
Volume40
Issue number1515
DOIs
Publication statusPublished - Jul 26 2004

Keywords

  • Coordination chemistry
  • Fluorescence
  • Luminescence
  • Polymers
  • X-ray diffraction
  • X-ray powder diffraction

ASJC Scopus subject areas

  • Chemistry(all)

Fingerprint Dive into the research topics of 'Synthesis, characterisation and optical spectroscopy of platinum(ii) di-ynes and poly-ynes incorporating condensed aromatic spacers in the backbone'. Together they form a unique fingerprint.

  • Cite this

    Khan, M. S., Al-Mandhary, M. R. A., Al-Suti, M. K., Al-Battashi, F. R., Al-Saadi, S., Ahrens, B., Bjernemose, J. K., Mahon, M. F., Raithby, P. R., Younus, M., Chawdhury, N., Köhler, A., Marseglia, E. A., Tedesco, E., Feeder, N., & Teat, S. J. (2004). Synthesis, characterisation and optical spectroscopy of platinum(ii) di-ynes and poly-ynes incorporating condensed aromatic spacers in the backbone. Journal of the Chemical Society. Dalton Transactions, 40(1515), 23772377-23852385. https://doi.org/10.1039/B405070C