Prashant Kumar

Bayreuth University, Germany

Research interests

Interests

Homogeneous catalysis

Research experience

Jan 2010–
Sep 2012

Research: Homogeneous catalysis by Novel Ir(COD) complexes

Bayreuth UniVersity · Chemistry · Bayreuth UniVersity

Prof Rhett kempe · Bayreuth

Other

Languages

English, German and Hindi
Other Interests

Angew chemie, Nature Chemistry, Inorganic Chemistry, Organometallic, Journal of organometallic chemistry, jerry march (mechanism of organic reaction)
J.D.Lee (Concise Inorganic chemistry)
Cotton and Willikinson 5th edition

Publications

Synthetic, spectral, structural and catalytic aspects of some “piano-stool” complexes containing 2-(diphenylphosphino)-ethylpyridine

Prashant Kumar, Mahendra Yadav, Ashish Kumar Singh, Daya Shankar Pandey

European journal of inorganic chemistry. 01/2010; 2010:704-715.

Reactions of the complexes [(η5-C5H5)Ru(PPh3)2Cl], [{(η6- arene)Ru(μ-Cl)Cl}2] (η6-arene = C6H6, C10H14, and C6Me6) and [{(η5-C5Me5)M(μ-Cl)Cl}2] (M = Rh, Ir) with 2-(2-diphenylphosphanylethyl) pyridine (PPh2Etpy) were investigated. Neutral κ1-P-bonded complexes [(η5-C5H5)Ru(κ1-PPPh2EtPy)( PPh3)Cl] (1... [more] Reactions of the complexes [(η5-C5H5)Ru(PPh3)2Cl], [{(η6- arene)Ru(μ-Cl)Cl}2] (η6-arene = C6H6, C10H14, and C6Me6) and [{(η5-C5Me5)M(μ-Cl)Cl}2] (M = Rh, Ir) with 2-(2-diphenylphosphanylethyl) pyridine (PPh2Etpy) were investigated. Neutral κ1-P-bonded complexes [(η5-C5H5)Ru(κ1-PPPh2EtPy)( PPh3)Cl] (1) and [(η6-arene)Ru(κ1-P-PPh2EtPy)Cl2] [arene = C6H6, (2). C10H14, (3), and C6Me6, (4)] were isolated from the reactions of [(η5-C5H5)Ru(PPh3)2Cl] and [{(η6-arene)- Ru(μ-Cl)Cl}2] with PPh2EtPy. Treatment of 1–4 with NH4BF4/ NH4PF6 in methanol allows the synthesis of cationic κ2-P,Nchelated complexes [(η5-C5H5)Ru(κ2-P,N-PPh2EtPy)(PPh3)]+ (5) and [(η6-arene)Ru(κ2-P-N-PPh2EtPy)Cl]+ [arene = C6H6, (6), C6H14, (7), and C6Me6 (8)]. On the other hand, the dimers [{(η5-C5Me5)M(μ-Cl)Cl}2] (M = Rh or Ir) reacted with PPh2EtPy in methanol to afford cationic κ2-P,N-chelated complexes [(η5-C5Me5)M(κ2-P-N-PPh2EtPy)Cl]+ [M = Rh, (9); Ir, (10)]. Complex 10 reacted with an excess amount of sodium azide or sodium chloride to afford the complexes [(η5-C5Me5)- Ir(κ1-P-PPh2EtPy)X2] (X = N3 – 11; Cl–, 12), establishing the hemilabile nature of the coordinated PPh2EtPy. The complexes were characterized by elemental analyses and various physicochemical techniques. The molecular structures of 1, 5, 6, 9, and 10 were determined crystallographically, and the catalytic potentials of 1–10 were evaluated towards transferhydrogenation reactions under aqueous conditions.