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Dr. Sangeeta  Kumar  Md image

Dr. Sangeeta Kumar Md

201 Highland St
Clinton MA 01510
978 658-8200
Medical School: Other - Unknown
Accepts Medicare: No
Participates In eRX: No
Participates In PQRS: No
Participates In EHR: No
License #: 261134
NPI: 1578581237
Taxonomy Codes:
207R00000X

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Synthesis of Amphiphilic Ru(II) Heteroleptic Complexes Based on Benzo[1,2-b:4,5-b']dithiophene: Relevance of the Half-Sandwich Complex Intermediate and Solvent Compatibility. - Chemistry (Weinheim an der Bergstrasse, Germany)
The detailed synthesis and characterization of four ruthenium(II) complexes [RuLL'(NCS)2 ] is reported, in which L represents a 2,2'-bipyridine ligand functionalized at the 4,4' positions with benzo[1,2-b:4,5-b']dithiophene derivatives (BDT) and L' is 2,2'-bipyridine-4,4'-dicarboxylic acid unit (dcbpy) (NCS=isothiocyanate). The reaction conditions were adapted and optimized for the preparation of these amphiphilic complexes with a strong lipophilic character. The photovoltaic performances of these complexes were tested in TiO2 dye-sensitized solar cell (DSSC) achieving efficiencies in the range of 3-4.5 % under simulated one sun illumination (AM1.5G).© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Heteroleptic Ru(ii)-bipyridine complexes based on hexylthioether-, hexyloxy- and hexyl-substituted thienylenevinylenes and their application in dye-sensitized solar cells. - Physical chemistry chemical physics : PCCP
A series of eight Ru(ii) heteroleptic complexes incorporating an ancillary [2,2']bipyridine functionalised at the [4,4'] positions with one (-type) or two (-type) thienylenevinylenes (nTVs, n = 2 or 4) is reported. Three types of substitutions have been used for nTVs: hexylthioether, hexyloxy and hexyl. The characterisation of the half-sandwich intermediates and final complexes is provided. In particular, the half-sandwich complexes in the -type series are obtained as a racemate, whereas the heteroleptic complexes consist of two regioisomers. Finally, these complexes have been tested as dyes in dye-sensitized solar cells (DSSCs). Counterintuitively, better performances were obtained for -type complexes with shorter 2TV moieties. The best performing dye was the Ru(ii) complex mono-functionalized with a 2TV moiety having an hexylthioether substitution (), which achieved a maximum power efficiency of 2.77% under full sun illumination (AM1.5G standard conditions). The structure-performance relationship in DSSCs is discussed based on photovoltaic and electrochemical data and DFT-calculations.

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