Stanley K. Madan
Binghamton University
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Featured researches published by Stanley K. Madan.
Journal of Inorganic and Nuclear Chemistry | 1966
Stanley K. Madan; A.M. Donohue
Abstract Co-ordination compounds with 2,2′-bipyridine-1,1′-dioxide(bipyO2) having the composition [ZrO(bipyO2)3](ClO4)2·2H2O, [Th(bipyO2)4](ClO4)4, [VO(bipyO2)2](ClO4)2, [UO2(bipyO2)2](ClO4)2, [Mo2O4Cl2(bipyO2)2]·2H2O and [Mo2O3Cl4(bipyO2)2]·2H2O have been synthesized. These new compounds have been characterized by infra-red spectra, electronic absorption spectra, magnetic moments and electrical conductance. Infra-red spectra indicate that M ← L bond (M = oxycation or metal ion, L = Ligand) in these complexes appears between the region 355 cm−1 to 430 cm−1.
Journal of Inorganic and Nuclear Chemistry | 1968
Doreen M. Mehs; Stanley K. Madan
Abstract The synthesis and physical properties of a series of new compounds of the general formula Ln(bipyO 2 ) 4 (ClO 4 ) 3 (where Ln = La, Pr, Nd, Sm, Gd, Dy, Ho, Er, Yb, Y; bipyO 2 = 2,2′-bipyridine 1,1′-dioxide) are reported. Infrared spectra indicate that coordination is through the oxygen. Infrared spectra, as well as conductance measurements indicate that the metal ← bipyO 2 bond is weaker in the lanthanide complexes than in the similar transition metal complexes.
Journal of Inorganic and Nuclear Chemistry | 1967
Stanley K. Madan; J.A. Sturr
Abstract A series of metal complexes of γ-butyrolactam (BuL) and N-methyl-γ-butyrolactam (NMBuL) have been synthesized, showing co-ordination through the oxygen atom. The perchlorate salts of these complexes have a composition of the general formulas [M(BuL) 6 ] n + (ClO 4 ) n , and [M(NMBuL) 4 or 6 ] n + (ClO 4 ) n (M = Cr 3+ , Al 3+ , Fe 2+ , Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Cd 2+ , Zn 2+ , Ca 2+ , Mg 2+ ). The halide complexes of the Co 2+ , Cu 2+ , Mn 2+ and Fe 3+ show, however, a marked structural difference from the perchlorate complexes. The Co(II) halides exhibit the general formula [Co(BuL) 6 ][CoX 4 ] (X = Cl, Br, I and SCN), indicating octahedral cationic and tetrahedral anionic species. The Cu(II) and Mn(II) chlorides have structures of the general formula [M(BuL) 2 Cl 2 ] and [M(BuL)Cl 2 ]. A complex having the formula [Mn(NMBuL)Cl 2 ] has also been isolated. The Fe(III) chloride complex exhibits the structure of the type [FeL 4 Cl 2 ][FeCl 4 ]. These complexes have been characterized by their i.r. spectra, electrical conductivity measurements, magnetic moments, X-ray diffraction patterns and electronic absorption spectra. The ligand field parameters Dq , B′ and β have been calculated for the octahedral cobalt(II) perchlorate complexes, and the tetrahedral [CoX 4 ] 2− species, verifying the proposed geometries and confirming the previously suggested donor order of BuL > NMBuL in the spectrochemical series.
Journal of Inorganic and Nuclear Chemistry | 1969
Warren V. Miller; Stanley K. Madan
Abstract The syntheses and physical properties of the crystalline compounds [Eu(bipyO2)4](ClO4)3 and [Tb(bipyO2)4](ClO4)3(bipyO2-2,2′-bipyridine, 1,1′-dioxide) are reported. The compounds are characterized by i.r. spectra and conductance measurements. Both complexes are observed to fluorescence in both the solid state and in nitromethane solution, and the fluorescence spectra for both the europium and terbium complexes in solution are reported.
Journal of Inorganic and Nuclear Chemistry | 1968
Warren V. Miller; Stanley K. Madan
Abstract The syntheses and physical properties of the crystalline compounds [Ln(BuL) 8 ](NO 3 ) 3 (Ln La, Nd, Gd) (BuL = γ-butyrolactam), and [Ln(BuL) 3 (NO 3 ) 3 ] (Ln Dy, Er, Yb) are reported. Infra-red spectra of these complexes indicate that in the solid state the La, Nd, and Gd complexes contain ionic nitrate, while the Dy, Er, and Yb complexes contain covalent nitrato groups. Both molecular weight and conductance data indicate that the complexes containing ionic nitrate dissociate in solution. Both analyses and spectral studies indicate that the larger lanthanide ions have coordination numbers of eight, while the smaller lanthanides are seven coordinated.
Journal of Inorganic and Nuclear Chemistry | 1966
Stanley K. Madan; C. Goldstein
Abstract The syntheses and properties of the crystalline compounds, [CoL 2 X 2 ] (L = e-thiocaprolactam) (X = Cl, Br, I) and [CoL 4 ](ClO 4 ) 2 ; are reported. The spectral parameters Dq , B ′ and β are calculated for the sulphur-co-ordinated complexes. The data indicate tetrahedral stereochemistry for these complexes. e-Thiocaprolactam is assigned a position relative to the other sulphur-containing donors in the spectrochemical series. Infra-red spectra indicate that Co ← S bond in these complexes appears at 390 cm −1 .
Inorganica Chimica Acta | 1972
Shiaw‐Ta Yuan; Stanley K. Madan
Complexes SbCl3(BuL)2, SbBr3(BuL)2, BiCl2(BuL)2.5, and HgCl2(BuL) (BuL = γ-butyrolactam) have been prepared and investigated spectroscopically. Infrared and Raman assignments for the solids are discussed, with special emphasis on metal-ligand vibrations. All BuL molecules are shown to be coordinated through oxygen, as indicated by the internal ligand frequency shifts. Structure considerations are presented for the solid-state species.
Journal of Inorganic and Nuclear Chemistry | 1974
Paul B. Bertran; Stanley K. Madan
Abstract The complexes SbCl 3 (TMSO) 2 , SbBr 3 (TMSO) 2 , BiCl 3 (TMSO) 3 , BiBr 3 (TMSO) 3 , ZnCl 2 (TMSO) 2·5 , CdCl 2 (TMSO) 1·5 , CdCl 2 (TMSO), and HgCl 2 (TMSO) 1·5 (TMSO = tetramethylene sulfoxide) have been prepared and investigated spectroscopically. The near and far i.r. and Raman assignments for the solids are discussed with emphasis on the metal-halogen and metal-oxygen vibrations. All molecules are shown to be coordinated through the oxygen, as indicated by the ligand frequency shifts to lower frequencies. Structure considerations for the solid-state species are discussed.
Journal of Inorganic and Nuclear Chemistry | 1972
Paul B. Bertan; Stanley K. Madan
Abstract The syntheses and physical properties of crystalline lanthanide complexes, La(TMSO)4− (NO3)3 (TMSO = tetramethylene sulphoxide), Ln2(TMSO)7(NO3)6 (Ln = Nd, Sm) and Ln2(TMSO)6− (NO3)6 (Ln = Gd, Dy, Er, Yb) are reported. The i.r. spectra, molar conductivities, molecular weights and X-ray powder patterns are also included. The i.r. spectra indicate that, in all cases, co-ordination occurs through the oxygen atom of TMSO, and all nitrate groups are co-ordinated in the solid state. The co-ordination number is believed to be eight and the nitrate co-ordination changes from predominantly monodentate to predominantly bidentate across the period.
Journal of Inorganic and Nuclear Chemistry | 1968
Warren V. Miller; Stanley K. Madan
Abstract The syntheses and physical properties of the crystalline compounds [Ln(BuL)8](ClO4)3 (Ln = La, Pr, Nd, Sm, Gd, Dy, Er, Yb, Y) (BuL = γ-butyrolactam), [Ln(NMBuL)8](ClO4)3(Ln = La, Pr, Nd, Sm, Gd) (NMBuL = N-methyl-γ-butyrolactam), and [Ln(NMBuL)7](ClO4)3 (Ln = Dy, Er, Yb, Y) are reported. For most of the complexes the infrared, visible, and ultraviolet spectra are reported, as well as the magnetic susceptibilities, molar conductivities, X-ray powder patterns, and molecular weights. Both the composition of these compounds and the X-ray data indicate clearly the existence of two isomorphous series of NMBuL-complexes, one including compounds of the formulas [Ln(NMBuL)8](ClO4)3 and other compounds of the formulas [Ln(NMBuL)7](ClO4)3.