http://rulrepository.ru.ac.bd/handle/123456789/117 Tue, 07 Apr 2026 21:43:39 GMT 2026-04-07T21:43:39Z http://rulrepository.ru.ac.bd/handle/123456789/985 Synthesis of Chalcone Epoxides and Studies of their Antimicrobial Activities Rashid, Md. Mamun-Ar- Flavonoid compounds constitute one of the major classes of naturally occurring products. These types of compounds show antimicrobial (antibacterial and antifungal) activities and are used widely as drugs for the treatments of different types of diseases. Chalcone epoxides and their derivatives have attracted considerable attention due to their significant biocidal, pharmaceutical and antioxidant activities. Chalcone and its derivatives are used as inhibitors angiogenesis. Chalcone and its epoxides have been used as antiterror or anticancer agents and to treat a number of conditions or disease states in which angiogenesis is a factor, including angiogenic skin disease such as psoriasis, acne, rosacea, warts, eczema, hemangiomas, lymph angiogenesis, among numerous others, as well as chronic inflammatory disease such as arthritis. They also control and reduce hypertension. In the light of these results, we have chosen eight chalcones and their corresponding chalcone epoxides. We synthesized them and studied their biological activities. They were 21-hydroxy-2,4,5-trimethoxychalcone epoxide; 2'-benzyloxy- 2,4,5-trimethoxychalcone epoxide; 4'-methyl-2-chlorochalcone epoxide; 4'­methyl-4-chlorochalcone epoxide; 2'-hydroxy-4-nitrochalcone epoxide; 2'­benzyloxy-4-rnethoxychaclone epoxide; 21 -hydroxy-3 ,4-methylenedioxy chalcone epoxide; 2' -benzyloxy-3 ,4-methylene-dioxychalcone epoxide. The above chalcone epoxides were synthesized from their corresponding chalcones using NaOH'tf2O2 as an oxidizing agent. This Thesis is Submitted to the Department of Chemistry, University of Rajshahi, Rajshahi, Bangladesh for The Degree of Master of Philosophy (MPhil) Fri, 01 Jan 2010 00:00:00 GMT http://rulrepository.ru.ac.bd/handle/123456789/985 2010-01-01T00:00:00Z http://rulrepository.ru.ac.bd/handle/123456789/960 Studies on the Transition Metal Complexes of Acids and Imides with Amine Bases Rahman, Md. Mahabubar This thesis is presented on the interaction of metal ions with stoichiometric amounts of organic ligands containing O and N donors of which metal complexes have been widely used in biological and catalytical point of view. The thesis is divided into ten chapters. 1. First one is an introductory chapter. The chapter is designed to provide sufficient background and usefulness of the present study. 2. The second chapter describes the experimental techniques which include the physical measurement and analytical techniques. 3. Third chapter has been devoted to the preparation and characterization of mixed ligands complexes of Zr (VI) ions with oxalic acid and hetero cyclic amines. The general formula of the complexes are as follows; [Zr (IV) (oxa)2 L2]. Where oxa = oxalic acid L = Q, 2-Apy, 8-HQ, a-Pie, 2,2'-Bipy. The complexes were prepared in the solid form and characterized by elemental analysis, conductivity, magnetic measurements, infrared, and electronic spectroscopic studies. The infrared spectra of the complexes confirmed the co-ordination of metal ion with ligands. The presence of water molecule inside the co­ordination sphere was also confirmed by infrared spectra. Electronic spectra and magnetic measurement confirmed that the Zr (IV) complexes were of octahedral structure…………………….. This Thesis is Submitted to the Department of Chemistry, University of Rajshahi, Rajshahi, Bangladesh for The Degree of Master of Philosophy (MPhil) Fri, 01 Jan 2010 00:00:00 GMT http://rulrepository.ru.ac.bd/handle/123456789/960 2010-01-01T00:00:00Z http://rulrepository.ru.ac.bd/handle/123456789/937 Synthesis-and characterization of some liquid crystal type complexes of Fe, Co, Ni and Cu. Begum, Mst. Sabina Recently scientists gave special attention to the synthesis of transition metal complexes due to their catalytic, biological mesogenic and paramagnetic properties. Hydrazone ligands and their complexes have pronounced biological as well as mesogenic properties. Considering the above important properties of transition metal hydrazone complexes the present work synthesized and characterized some novel hydrazone complexes of iron(ll1), nickel(II) and copper(II) having some long chain residue or tailing. ------ This Thesis is Submitted to the Department of Chemistry , University of Rajshahi, Rajshahi, Bangladesh for The Degree of Master of Philosophy (MPhil) Wed, 01 Jan 2003 00:00:00 GMT http://rulrepository.ru.ac.bd/handle/123456789/937 2003-01-01T00:00:00Z http://rulrepository.ru.ac.bd/handle/123456789/880 Studies on Some Transition Metal Complexes with LlX:84 Ali, Rustom The research work presented in this thesis deals with the preparation and characterization of some new complexes of the second transition metal ions (Zr4+, Ag+ and Cd2+) with the new solvent execration reagent, LIX84 (i.e.,2-hydroxy-5- nonylacetophenone oxime) as a ligand. For their synthesis, the prepared aqueous solutions of the metal chlorides (for Cd (II), nitrate) are allowed to react with an n-hexane solution of LIX84 (containing KOH) in different ratios. The prepared complex.es have been characterized by conductivity and magnetic measurements, infrared spectra and electronic spectral studies. Their percent solubilities in various organic solvents and decomposition temperatures have been measured. The molecular weight of the complexes has also been determined by the cryoscopic method. This Thesis is Submitted to the Department of Chemistry, University of Rajshahi, Rajshahi, Bangladesh for The Degree of Master of Philosophy (MPhil) Mon, 01 Jan 2007 00:00:00 GMT http://rulrepository.ru.ac.bd/handle/123456789/880 2007-01-01T00:00:00Z