http://rulrepository.ru.ac.bd/handle/123456789/85 Tue, 07 Apr 2026 21:40:22 GMT 2026-04-07T21:40:22Z http://rulrepository.ru.ac.bd/handle/123456789/995 Chemical Investigations on Lac and Its Derived Products Haque, Muhammad Zahurul Allah, the Almighty has created each and everything in this universe. There are creatures, most negligible in shape and size that has tremendous importance. One of such a creature is !~c inse~t1 Ke_rrig_ lacca. Its size is 0.35 mm but its importance considering industrial value is of magnificent nature. Its resinous secretion obtained on the branches of some selected host plants is of vital industrial importance in many fields and is benefiting the human beings. This secretion from the glands of the lac insect is called lac. This is one of Allah's Qudrat that such a small insect (creature) can produce a widely applicable secretion, the lac. Hence a piece of research work in this field is unde1iaken in order to investigate the properties of different lac products and to study the chemistry of lac. In the beginning of the thesis is given a General Introduction comprising of the origin and history of lac, lac production in Bangladesh etc. For convenience of presentation, the experimental work has been divided into four small chapters. Each chapter is complete within itself and has been written in the conventional fonn of a paper. Effort has been made for literature coverage upto dclte. The thesis is appended with a list of paper and also reprint of publications. I express my sincere gratitude and indebtedness to my respected teachers, Dr. M. Umar Ali, Professor, Department of Chemistry, Rajshahi University, Rajshahi and Dr. M. Omar Faruq, Director (Retd), Bangladesh Council of Scientific and Industrial Research (BCSIR) Laboratories, Rajshahi for their keen interests and valuable inspiring and indespensable guidance throughout the course of these studies and preparation of this thesis. I am very much grateful to Dr. M. Yusuff Ali, Ex-Vice Chancellor, Rajshahi University, Professor, Department of Chemistry, Rajshahi University, Rajshahi for his inspiration and encouragement during the study period. I am also grateful to Professor M.A . .lalil Miah, Chairman, Department of Chemistry, along with other professors of this department, Rajshahi University, Rajshahi for providing necessary facilities, inspiration and helpful advise. My sincere thanks are due to Dr. M. Rezaul Karim, Chainnan, Department of Bio-Chemistry, Rajshahi University, Rajshahi for providing necessary facilities 111 testing antibacterial activities of the synthesised products. My thanks are also extended to Dr. M. Golbar Hossain, Director, BCSIR Laboratories, Rajshahi for his cooperation and encouragement during the course of the study. I also take the opportunity to express my thanks to Mr. M. Ismail Hussain Khan, Senior Scientific Officer (Retd) BCSlR Laboratories, Rajshahi for his many fruitful discussions. I wish to express my thankfulness to the authority, BCSIR, Dhaka and Ministry of Sceince & Technology, Government of Bangladesh for the award of scholarship under Human Resource Development Programme (HRDP) and also for granting me study leave with fu1l pay for Ph.D. Programme. I am thankful to Mr. Akram Hossain, Department of Chemistry, Dhaka University, Dhaka for recording IR spectra of my research samples. I have no hesitation to express my gratefulness to my friends, M. Maksud Ali, M. Siddiqur Rahman, M. Abdul Hye and M. Rafiquzzaman for their occasional help during this work at the Laboratories. Thanks are also due to my colleagues, Mr. Ranajit Kumar Sarker, M. Mesbahul Alam, M. Azizur Ralunan, Mrs. Seatara Khatun, Mrs. G.R.M. Astaq Mohal Khan, M. Lutfor Ralunan, .M. Mostafizur Ralunan and M. Kobad Hossain for their cooperation throughout the progress of the work. I am thankful to Md. Shahazada, B.T.S. Commercial Institute for his sincere type setting. I express my heartiest gratitude to my parents who brought me up and opened my eyes of lrnowledge. Finally, I acknowledge with great pleasure the good wishes and cooperation of my other research co1leagues, friends and all other relations. This Thesis is Submitted to the Department of Chemistry, University of Rajshahi, Rajshahi, Bangladesh for The Degree of Doctor of Philosophy (PhD) Fri, 01 Jan 1999 00:00:00 GMT http://rulrepository.ru.ac.bd/handle/123456789/995 1999-01-01T00:00:00Z http://rulrepository.ru.ac.bd/handle/123456789/947 Peroxo Complexes and Their Oxygen Transfer Reactions Khan, Mr. Abdur Rahim The chemistry of the peroxo complexes of various transition metals has received considerable attention in recent· years mainly because they are sources of active oxygen atoms and can be used as stoichiometric as well as catalytic oxidants for organic and inorganic substrates; eg,, they can be successfully used for the oxidation of olefins, ketones, phosphines, arsines etc. We have successfully employed peroxo complexes to generate glycerine from allyl alcohol which is. indeed an industrial aspect of the project. The present thesis describes isolation and characterisation of different peroxo complexes of Zr (IV), Th (IV), Mo (VI), W .{ VI) and U {VI) . ions containing different bi-dentate, tri-dentate and quardri-dentate ligands. A few oxygen transfer reactions of the complexes towards olefins, ketones, triphenyl phosphine and tripheny] arsine have been investigated.----- This Thesis is Submitted to the Department of Chemistry, University of Rajshahi, Rajshahi, Bangladesh for The Degree of Doctor of Philosophy (PhD) Fri, 01 Jan 1993 00:00:00 GMT http://rulrepository.ru.ac.bd/handle/123456789/947 1993-01-01T00:00:00Z http://rulrepository.ru.ac.bd/handle/123456789/934 Peroxo Complexes and their Oxygen Transfer Reactions Khan, Mr. Abdur Rahim The chemistry of the peroxo complexes of various transition metals has received considerable attention in recent· years mainly because they are sources of active oxygen atoms and can be used as stoichiometric as well as catalytic oxidants for organic and inorganic substrates; e.g., they can be successfully used for the oxidation of ole-fins, ketones, phosphines, arsines etc., We have successfully employed peroxo complexes to generate glycerin from ally l alcohol which is. indeed, an industrial aspect of the project. The present thesis describes isolation and characterization of different peroxo complexes of Zr (IV), Th (IV), Mo (VI), W (VI) and U (VI) ions containing different bi-dent. Ate, tri-dentate and quardri-dentate ligands. A few oxygen transfer reactions of the complexes towards ole-fins, ketones, triphenyl phosphine and triphenyl arsine have been investigated…….. This Thesis is Submitted to the Department of Chemistry, University of Rajshahi, Rajshahi, Bangladesh for The Degree of Doctor of Philosophy (PhD) Fri, 01 Jan 1993 00:00:00 GMT http://rulrepository.ru.ac.bd/handle/123456789/934 1993-01-01T00:00:00Z http://rulrepository.ru.ac.bd/handle/123456789/784 Studies on the Transition Metal Complexes of Schiff Bases with Heterocyclic Amines Banu, Laila Arjuman With an aim to prepare some model complexes, six ligands were prepared. They are arranged in three series depending on nature of the ligands and their donating capability. A variety of aldehydes and a verity of primary amines were used to prepare different Schiff base ligands. The thesis also extended to synthesis and characterization of some transition metal complexes containing Schiff base as primary ligands and hetero-cyclic amines as secondary ligands. The complexes were isolated in solid form and characterized on the basis or elemental analysis, conductivity, magnetic measurements, UV, IR and NMR spectral analysis and crystallographic analysis also. The Schiff base complexes were screened for biological activities such as antibacterial, anti fungal, cytotoxicity and antioxidant properties. For description, we have divided the whole thesis into three sections viz. section A, B, & C. SECTION-A This section contains two chapters (chapter I-Il) ClfAPTER-1 This is an introductory chapter. This chapter is designed to provide sufficient background and usefulness of the present study. CHAPTER-II This chapter describes the experimental techniques, which include the chemicals, physical measurements, and analytical techniques. SECTTON-B This chapter contains four chapters (chapter III-VJ) Dharmaraj an et. al. 109 have reported the synthesis and evaluation of various diclofenac acid hydra zones and amides for invitro and in vivo antimicrobial activities against Micro Bacterium tuberculosis. Schiff base Tetrazamacrocyclic ligand and its complexes of the types, [MLX2] and [CuL]X2 [M= Co (II), Ni (II), Zn (II); X= er, N03-/ synthesized and characterized by elemental analyses, mass, H-N MR, IR, U V-Viss, magnetic susceptibility and molar conductance data. The complexes shown antimicrobial activity against various pathogens. 110-111 Lei et. al. 112-113 have reported the synthesis of a series of Schiff bases (Fig. 4) by reacting 5-Chlorosalicyldehyde and primary amines. The compounds were assayed for antibacterial and anti fungal activities. It is also reported that salicylaldehyde derivatives, with one or more halo-atoms in the aromatic ring, showed variety of biological activities. This Thesis is Submitted to the Department of Chemistry, University of Rajshahi, Rajshahi, Bangladesh for the degree of Doctor of Philosophy (PhD) Wed, 01 Jan 2014 00:00:00 GMT http://rulrepository.ru.ac.bd/handle/123456789/784 2014-01-01T00:00:00Z