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Functionalized Carborane Complexes of the [M(CO)2(NO)]2+ Core (M = 99mTc, Re): A New Class of Organometallic Probes for Correlated in Vitro and in Vivo Imaging

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McMaster Institute for Applied Radiation Sciences, McMaster University, Chemical Biology Graduate Program, Department of Chemistry, McMaster University, and Departments of Chemistry and Medical Physics & Applied Radiation Sciences, McMaster University, Hamilton, Ontario, Canada, L8S 4M1
* To whom correspondence should be addressed. Tel: +1-905-525-9140, ext. 22840. Fax: +1-905-522-7776. E-mail: [email protected]
†McMaster Institute for Applied Radiation Sciences.
‡Chemical Biology Graduate Program, Department of Chemistry.
§Departments of Chemistry and Medical Physics & Applied Radiation Sciences.
Cite this: Organometallics 2009, 28, 10, 2986–2992
Publication Date (Web):April 21, 2009
https://doi.org/10.1021/om8011807
Copyright © 2009 American Chemical Society

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    Abstract

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    Functionalized carborane complexes of the [M(CO)2(NO)]2+ (M = Re, 99mTc) core have potential utility as matched pairs of probes for correlated optical (M = Re) and scintigraphic (M = 99mTc) imaging. A synthetic route to closo-rhenacarboranes of the type [Re(CO)2(NO)(RR′C2B9H9)] in a manner suitable for the preparation of the radioactive technetium-99m analogues has been developed, resulting in the isolation of four novel metallacarboranes [Re(CO)2(NO)(RR′C2B9H9)], which exhibit both 3,1,2 (6a: R = H, R′ = Bn) and 2,1,8 (7a: R = R′ = H; 8a: R = H, R′ = Ph; 9a: R = R′ = Bn) cage configurations. These complexes absorb strongly at 300−348 nm; 6a9a fluoresce weakly at ambient temperature following excitation at 300 nm (7a) or ∼340 nm (6a, 8a/9a), with emission maxima ranging between 313 and 411 nm. A microwave-assisted approach was used to prepare radioactive [99mTc(CO)3]+-carborane complexes (1b4b) at the tracer level. When an analogous aqueous nitrosation methodology was applied to generate dicarbonylnitroso-closo-technetacarboranes, the novel complexes 6b, 8b, and 9b were isolated in good radiochemical yields (62−79%). In aqueous solutions, slow decomposition of 6b and 8b, but not 9b was observed. To better understand this process, the radioactive 186/188Re analogue of 8a was also prepared.

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    The crystallographic CIF file for compound 8a and additional fluorescence data are included as Supporting Information and is available free of charge via the Internet at http://pubs.acs.org.

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