Nitrogen-doped TiO 2 (N-doped TiO 2 ) photocatalyst with nanosize has been synthesized through the hydrolysis of N-substituted titanium isopropoxide precursors. The light absorption onset shifts to the visible region at 550 nm with N-doped TiO 2 . A clear decrease in the band gap and the nitrogen 2p states on the top of the valence band on N-doped TiO 2 (compared to Degussa P25) is deduced from the optical absorption spectroscopy results. Photocatalytic decomposition of methylene blue has been carried out in the visible region, which N-doped TiO 2 shows higher activity than the Degussa P25.

The powder complex of tris(phenanthroline) copper(II) trifluoromethanesulfonate dihydrate has been synthesized by direct interaction of the corresponding precursors, copper(II) nitrate, phenanthroline, and potassium triflate. The metal content found to be 6.76% corresponds to the theoretical value of 6.77% in [Cu(phen) 3 ](CF 3 SO 3 ) 2 .2H 2 O. The equivalent electrical conductance producing the charge ratio of cation by anion to be 2: 1, should confirm the formula. The magnetic moment, µ eff , of this complex which was to be 1.85-1.90 B.M, indicates that the complex is paramagnetic corresponding to spin-only value for one unpaired electron. UV-Vis spectrum of the complex reveals the only one broad absorption observed at about 681.50 nm (14673.51 cm -1 ), being associated with the spin allowed transition, 2 E g → 2 T 2g . The extinction coefficient of 48 Lmol 1 cm -1 indicates the adoption of octahedral environment in this complex. The infrared spectrum shows absorptions of ligand group which is influenced by the metal-ligand interaction in this complex. The powder XRD of this complex was refined by Le Bail method of Rietica program and found to be fit as triclinic symmetry of space group P1.

The powder complex of tris(bipyridine)cobalt(II) trifluoromethanesulfonate octahydrate has been synthesized by direct interaction of the corresponding aqueous solutions (and drops of ethanol) of cobalt(II) nitrate, bipyridine, and potassium triflate. The yellow-orange powder produced was filtered off and allowed to dry on an aeration for characterization. AAS measurement showed the content of metal to be 6.06%, corresponding to the theoretical value of 6.06% in [Co(bipy)3](CF3SO3)2•8H2O. The analysis of conductance producing the charge ratio of cation to anion to be 2:1, confirms the formula. The magnetic moment, µeff, of this complex which was to be 4.5-4.9 BM, indicates that the complex is paramagnetic corresponding to the three unpaired electrons with a significantly orbital contribution. UV-Vis spectrum of the complex reveals the first band observed at about 11100 cm -1 , which is associated with the spinallowed transition, 4 T1g → 4 T2g. A distinct shoulder at only about 16100 cm -1 should be associated with the spinforbidden transition of 4 T1g → 2 T2g, 2 T2g (G). The expected second and third bands which are associated with spinallowed transitions of 4 T1g → 4 T1g(P) and 4 T1g → 4 A2g at higher energy were not well resolved. The infrared spectrum shows absorptions of the functional group of ligand which is influenced by the metal-ligand interaction in this complex. The powder XRD of this complex was refined using Le Bail method of Rietica program and found to be fit as monoclinic symmetry with a space group of C2/c. (II) nitrat, bipiridin, dan kalium triflat. Serbuk kuningorange yang terbentuk disaring dan dikeringkan untuk keperluan karakterisasi. Pengukuran AAS yang menunjukkan kandungan logam 6,06%, sesuai dengan nilai teoretis 6,06% pada [Co(bipy)3](CF3SO3)2•8H2O. Analisis daya hantar listrik ekivalen menghasilkan rasio muatan kation/anion 2:1, menegaskan formula tersebut. Momen magnetik, µeff, sebesar 4.5-4.9 BM, menunjukkan kompleks bersifat paramagnetik yang sesuai dengan tiga elektron nir-pasangan dengan kontribusi orbital yang kuat. Spektrum UV-Vis kompleks mengungkap pita pertama pada 11100 cm -1 , yang diasosiasikan dengan transisi spin-terijin, 4 T1g → 4 T2g. Suatu pundak yang sangat jelas pada 16100 cm -1 menunjuk pada transisi spin-terlarang, 4 T1g → 2 T2g, 2 T2g (G). Pita kedua dan ketiga yang diharapkan menunjuk pada transisi spinterijin 4 T1g → 4 T1g(P) dan 4 T1g → 4 A2g pada energi yang lebih tinggi tidak muncul secara jelas. Spektrum infra merah menunjukkan serapan gugus-fungsi khas bagi ligan yang dipengaruhi oleh interaksi logam-ligan. Difraksi sinar-X serbuk kompleks ini yang dianalisis menurut metode Le Bail dalam program Rietica menghasilkan simetri kristal monoklin dengan grup ruang C2/c. ABSTRAK Serbuk kompleks tris(bipiridine)kobalt(II) trifluorometanasulfonat telah berhasil disintesis melalui interaksi langsung larutan air dengan beberapa tetes etanol dari kobalt

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The complex containing manganese(II), 1,10-phenanthroline (phen) as ligand and trifluoroacetate (TFA) as counter anion has been prepared and characterized. The electrical equivalent conductance, metal content, and TGA-DTA analysis suggests the complex to be [Mn(phen) 3 ](TFA) 2 .1.35H 2 O. The magnetic moment was found to be normal high-spin paramagnetic for 5 unpaired electrons in the electron configuration of manganese(II). The electronic spectral bands indicates the five posible spin-forbidden transitions of sextet ground state to quartet excited states. The IR spectral data signify the mode of vibrations typical for phenanthroline as well as TFA, while the images of SEM-EDX photographs confirm the existence of the coresponding elemental content, they reflect high crystalinity of the complex as evidence of the sharp peaks of the corresponding powdered diffractogram. The analysis of powder XRD refined by Le Bail program was found to be structurally triclinic symmetry of P Ι for the cationic complex with the cell