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ISSN 1998-9539

Low Temperature Spectroscopic Study of the Sulfides Binding by Dioxygen Adduct of Cobalt Porphyrin

Garik G. Martirosyan,a@ Astghik A. Hovhannisyan,a Arsen S. Azizyan,a Gohar S. Hovhannisyan,a and Alexei V. Iretskiib
aThe Scientific Technological Centre of Organic and Pharmaceutical Chemistry NAS RA, Molecule Structure Research Centre, 0014 Yerevan, Armenia
bLake Superior State University, Department of Chemistry, Sault Ste. Marie, MI 49783, USA
@Corresponding author E-mail: ggmartirosyan@gmail.com
 
DOI: 10.6060/mhc214035m
Macroheterocycles 2021 14(4) 280-285
 
Dedicated to the blessed memory of our beloved leader, colleague and friend Tigran Kutikyan
 
The interaction of dimethyl sulfide ((CH3 )2 S) and hydrogen sulfide (H2S) with cobalt porphyrin and its five-coordinate dioxygen complex was studied at low temperatures in sublimated porphyrin layers using electronic and infrared absorption spectroscopy. Upon addition of sulfides to a cryostat containing Co(TTP)O2 (TTP is meso-tetratolyl-porphyrinato dianion) at low temperatures, the FTIR and Vis electronic spectral changes were observed which are consistent with sulfide binding in axial trans-position to dioxygen. Density functional theory (DFT) computational analysis also supports formation of the six-coordinate adducts. These complexes are stable only at low temperatures and dissociate upon heating. 

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