Linear Bimetallic Alkynylplatinum(II) Terpyridyl Complexes Bearing p‑Phenylene Ethynylene Oligomers: Synthesis, Characterization, Aggregation, and Photophysical Properties
The series of luminescent bimetallic alkynylplatinum(II) terpyridyl complexes [(tBu3-tpy)PtCC(ArCC) n Pt(tBu3-tpy)](PF6)2 (I–IV; tBu3-tpy = 4,4′,4″-tritertbutyl-2,2′:6′,2″-terpyridine, Ar = C6H2(n-hexyloxy)2-2,5), in which two platinum(II) centers are linked by p-phenylene ethynylene oligome...
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Published in | Organometallics Vol. 33; no. 11; pp. 2738 - 2746 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
WASHINGTON
American Chemical Society
09.06.2014
Amer Chemical Soc |
Subjects | |
Online Access | Get full text |
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Summary: | The series of luminescent bimetallic alkynylplatinum(II) terpyridyl complexes [(tBu3-tpy)PtCC(ArCC) n Pt(tBu3-tpy)](PF6)2 (I–IV; tBu3-tpy = 4,4′,4″-tritertbutyl-2,2′:6′,2″-terpyridine, Ar = C6H2(n-hexyloxy)2-2,5), in which two platinum(II) centers are linked by p-phenylene ethynylene oligomers, were synthesized and characterized. Their electronic absorption and luminescent behaviors were studied by steady-state spectroscopy and transient spectroscopy. Concentration-dependent emission data show that all of the complexes form self-assembled aggregates in certain concentration ranges. Complex IV, bearing a longer p-phenylene ethynylene oligomer, exhibits higher propensity in comparison to I–III to form aggregates at a concentration of >1 × 10–5 M, probably resulting from stronger metal–metal interactions and π–π stacking. All four of the complexes displayed biexponential decays with lifetimes in the range of nanoseconds in dilute solutions. |
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ISSN: | 0276-7333 1520-6041 |
DOI: | 10.1021/om500115s |