NDLI: Cyclometallated ruthenium(II) carbonyl complexes with 1-pyrenaldehyde 4-R-3-thiosemicarbazones: Regioselective ruthenation of the 1-pyrenyl group

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Cyclometallated ruthenium(II) carbonyl complexes with 1-pyrenaldehyde 4-R-3-thiosemicarbazones: Regioselective ruthenation of the 1-pyrenyl group

Content Provider	Springer Nature Link
Author	PRABHU, RUPESH NARAYANA PAL, SAMUDRANIL
Copyright Year	2015
Abstract	A facile method for the synthesis of a series of cyclometallated ruthenium(II) carbonyl complexes with 1-pyrenaldehyde 4-R-3-thiosemicarbazones (H $_{2}\textit {L}^{\mathrm {n}}$ where the two H’s represent the dissociable thioamide and pyrenyl protons; R = H, Me and Ph) has been described. The characterization of the complexes having the general molecular formula trans-[Ru(L$^{n}$)(CO)(EPh$_{3}$)$_{2}$] (where E = P or As) were accomplished by elemental (CHN) analysis, magnetic susceptibility and spectroscopic (ESI-MS, IR, UV-Vis, emission and $^{1}$H-NMR) measurements. Electronic spectra of the complexes display multiple strong absorptions in the range 440–224 nm due to intraligand transitions. All the complexes exhibit emission bands that are characteristic of ligand centred emissive states. X-ray diffraction studies with representative complexes reveal a pincer-like 5,5-membered fused chelate rings forming CNS coordination mode of the thiosemicarbazonate ligand (L$^{n}$)$^{2-}$ via regioselective activation of 1-pyrenyl ortho C–H and formation of a distorted octahedral C$_{2}$NSE$_{2}$ coordination sphere around the ruthenium(II) centre. Cyclometallated ruthenium(II) carbonyl complexes with 1-pyrenaldehyde 4-R-3-thiosemicarbazones (H2Ln) are reported. In these complexes of formula trans-[Ru(Ln)(CO)(EPh3)2] (E = P or As), the 1-pyrenyl group of (Ln)2- is regioselectively ortho metallated and it acts as pincer-like CNS-donor. All the complexes are diamagnetic and they display ligand centred absorption and emission bands.
Starting Page	589
Ending Page	596
Page Count	8
File Format	PDF
ISSN	09743626
Journal	Journal of Chemical Sciences
Volume Number	127
Issue Number	4
e-ISSN	09737103
Language	English
Publisher	Springer India
Publisher Date	2015-05-24
Publisher Institution	Indian Academy of Sciences
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ruthenium(II) carbonyl thiosemicarbazones ortho-ruthenation regioselective crystal structure physical properties. Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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