Opto-electronic properties of quasi-linear, self-assembled platinum complexes : Pt-Pt distance dependence

M.G. Debije, M.P. Haas, de, J.M. Warman, M. Fontana, N. Stutzmann, M. Kristiansen, W.R. Caseri, P. Smith, S. Hoffmann, T. I. Solling

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Abstract

Charge-carrier mobilities of various self-assembled platinum complexes were measured by time-resolved microwave conductivity techniques in the temperature range –80 to +100¿°C. Eight compounds were investigated in the present study, including the original Magnus' green salt ([Pt(NH3)4][PtCl4]) and derivatives with the general structure [Pt(NH2R)4][PtCl4], where R denotes an alkyl side chain. In one instance, the chlorines were substituted with bromines. For these complexes, which all consist of a linear backbone of platinum atoms with Pt–Pt distances, d, varying from 3.1 to =¿3.6¿Å, a strong, inverse correlation was found between d and the one-dimensional charge-carrier mobility, Sµ1D. The highest value of Sµ1D at room temperature was observed for R¿=¿(S)-3,7-dimethyloctyl (dmoc) with Sµ1D =¿0.06¿cm2¿V–1¿s–1. Almost all materials exhibited a charge-carrier mobility that was relatively independent of the temperature over the range studied. One exceptional compound (R¿=¿(R)-2-ethylhexyl) showed a pronounced negative temperature dependence of the charge-carrier mobility; upon decreasing the temperature from +100¿°C to –80¿°C the charge-carrier mobility increased by a factor of about ten.
Original languageEnglish
Pages (from-to)323-328
JournalAdvanced Functional Materials
Volume14
Issue number4
DOIs
Publication statusPublished - 2004

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