A magnetically recoverable iron oxide (g-Fe 2 O 3 ) nanocatalyst (MRIONC) has been synthesized and characterized by XRD, FT-IR, XPS and TEM techniques and it was found that MRIONC is a new and highly efficient green catalyst for the synthesis of 2-phenylquinazolines from 2-aminoarylketones and benzyl amines under solvent free conditions, and in addition MRIONC could be easily recovered by a simple magnetic separation and recycled at least 5 times without significant loss in catalytic activity.

Taurine conjugates of two cholic acid derived oligomers with different spacers between the cholic acid units were synthesized. These molecules self‐assemble in aqueous media. The critical micelle concentration (CMC) values were measured by using fluorescence spectroscopic analysis and the aggregates were characterized by dynamic light scattering and electron microscopy. The cooperativity of the cholic acid units in these tetramers to solubilize cholesterol was investigated. The ability of these molecules to act as nanocarriers for liphophilic dyes was also studied.

Functionalized phosphine Pt complexes 1. 283 complexes. Summary Three new bifunctional phosphinoamide ligands of the type Ph2PCH2C(O)NHR (R = H, HDPA; Me, MDPA; Ph, PDPA) were prepared and characterized. Their ruthenium(II) complexes prepared from two different precursors, RuC12-(DMSO)4 and RuClz(PPh3) 3, are of similar composition and correspond to the formula, [RuCI(L)2(P O)2]C1 (L-DMSO/PPh3; phosphinoamide). However, RuC13-(AsPh3)2(MeOH) reacts with the phosphinoamide to yield a reduced product of the cis-RuClz(P--O)z type.The tigands and complexes were characterized by mass, i.r. and n.m.r, spectroscopy. Possible stereochemistries for the complexes are proposed.

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A series of deoxycholic and cholic acid-derived oligomers were synthesized and their ability to extract hydrophilic dye molecules of different structure, size, and functional groups into nonpolar media was studied. The structure of the dye and "dendritic effect" in the extraction process was examined using absorption spectroscopy and dynamic light scattering (DLS). The efficiency of structurally preorganized oligomers in the aggregation process was evaluated by 1-anilinonaphthalene-8-sulfonic acid (ANS) fluorescence studies. The possible formation of globular structures for higher-generation molecules was investigated by molecular modeling studies and the results were correlated with the anomaly observed in the extraction process with this molecule. The ability of these molecules for selective extraction of specific dyes from blended colors is also reported.