Renjusha, S; Dr.Prathapachandra Kurup,M R(Cochin University of Science and Technology, April , 2012)
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Abstract:
Thiosemicarbazones have recently attracted considerable attention due to
their ability to form tridentate chelates with transition metal ions through either
two nitrogen and sulfur atoms, N–N–S or oxygen, nitrogen and sulfur atoms,
O–N–S. Considerable interest in thiosemicarbazones and their transition metal
complexes has also grown in the areas of biology and chemistry due to
biological activities such as antitumoral, fungicidal, bactericidal, antiviral and
nonlinear optical properties. They have been used for metal analyses, for
device applications related to telecommunications, optical computing, storage
and information processing.The versatile applications of metal complexes of thiosemicarbazones in various fields prompted us to synthesize the tridentate NNS-donor
thiosemicarbazones and their metal complexes. As a part of our studies on
transition metal complexes with these ligands, the researcher undertook the current work
with the following objectives.
1. To synthesize and physico-chemically characterize the following
thiosemicarbazone ligands:
a. Di-2-pyridyl ketone-N(4)-methyl thiosemicarbazone (HDpyMeTsc)
b. Di-2-pyridyl ketone-N(4)-ethyl thiosemicarbazone (HDpyETsc)
2. To synthesize oxovanadium(IV), manganese(II), nickel(II), copper(II),
zinc(II) and cadmium(II) complexes using the synthesized
thiosemicarbazones as principal ligands and some anionic coligands.
3. To study the coordination modes of the ligands in metal complexes by
using different physicochemical methods like partial elemental analysis,
thermogravimetry and by different spectroscopic techniques.
4. To establish the structure of compounds by single crystal XRD studies
Description:
Department of Applied Chemistry, Cochin University of Science and Technology
Manju, Sebastian; Dr.Mohammed Yusuff,K K(Cochin University of Science & Technology, July , 2010)
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Abstract:
Schiff base complexes of transition metal ions have played a significant role in coordination chemistry.The convenient route of synthesis and thermal stability of Schiff base complexes have contributed significantly for their possible applications in catalysis,biology,medicine and photonics.Significant variations in cataltytic activity with structure and type are observed for these complexes.The thesis deals with synthsis and characterization of transition metal complexes of quinoxaline based Schiff base ligands and their catalytic activity study.The Schiff bases synthesized in the present study are quinoxaline-2-carboxalidine-2-amino-5-methylphenol,3-hydroxyquinoxaline-2-carboxalidine-2-amino-5-methylphenol,quinoxaline-2-aminothiophenol.They provide great structural diversity during complexation.To the best of our knowledge, the transition metal complexes of quinoxaline based Schiff bases are poorly utilised in academic and industrial research.
Description:
Dept.of Applied Chemistry,Cochin University of Science and Technology
Sreesha, Sasi; Dr.Prathapachandra Kurup,M R(Cochin University of Science & Technology, October , 2008)
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Abstract:
Metallo-organic chemistry,incorporating the frontiers of both inorganic and organic chemical aspects,is a topic of utility concern.The first exploration of coordinated metal complexes dates back to the ninettenth century,during the days of Alfred Werner.Thereafter,inorganic chemistry witnessed a great outflow of coordination compounds,with unique structural characteristics and diverse applicatons.The diversity in structures exhibited by the coordination complexes of multidentate ligands have led to their usage as sensors,models for enzyme mimetic centers,medicines etc.The liganda chosen are of prime importance in determining the properties of coordination compounds.Schiff bases are compounds obtained by the condensation of an aidehyde or ketone with an amine.The chemical properties of Schiff bases and their complexes are widely explored in recent years owing to their pharmacological activity,their catalytic activities and so on.On the other hand pseudohalides like azide and thiocyanate are versatile candidates for the construction of dimeric or polymeric complexes having excellent properties and diverse applications.So a combination of the Schiff bases and the pseudohalogens for the synthesis of metal complexes can bring about interesting results.An attempt into this area is the besis of this Ph.D theis.
Description:
Department of Applied Chemistry,
Cochln University of Science and Technology
Suja, Krishnan; Dr.Prathapachandra Kurup,M R(Cochin University of Science and Technology, June , 2008)
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Abstract:
Coordination chemistry of pentadentate 2,6-diacetylpyridine
bis(thiosemicarbazone) Schiff base ligands has been intensively studied due to the versatility of the molecular chain in order to obtain very different
geometries as well as their broad therapeutic activity. Metal complexes of
thiosemicarbazone with aldehydes and ketones have been widely reported.
But there have been fewer reports on potential pentadentate
bis(thiosemicarbazones) formed from 2,6-diacetylpyridine. Keeping these in
view, we have synthesized four bis(thiosemicarbazone) systems with
2,6-diacetylpyridine. In the present work, the chelating behavior of
bis(thiosemicarbazones) are studied, with the aim of investigating the
influence of coordination exerts on their conformation and or configuration, in
connection with the nature of the metal and of the counter ion. The selection
of the 2,6-diacetylpyridine as the ketonic part was based on its capability to
form polynuclear complexes with different coordination number. The doubled
armed bis(thiosemicarbazones) can coordinate to a metal centre as dianionic
ligand by losing its amide protons or it can coordinate as monoanionic ligand
by losing its amide proton from one of the thiosemicarbazone moiety or it can
also be coordinate as neutral ligand. Hence it is interesting to explore the
coordinating capabilities of these ligands whether in neutral form or anionic
form and to study the structural variations occurring in the ligands during
complexation such as change in conformation.
Description:
Department of Applied Chemistry,
Cochin university of Science and Technology
Maheswaran, Sithambaresan; Dr.Prathapachandra Kurup,M R(Cochin University of Science and Technology, April , 2012)
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Abstract:
The unusual coordination modes of semicarbazones when bound to
metals, the wide applications and structural diversity of metal complexes of
semicarbazones provoked us to synthesize and characterize the tridentate ONO
and NNO-donor semicarbazones and their transition metal complexes. This
work is focused on the studies on complexes of three N4-phenylsemicarbazones
synthesized by changing the carbonyl compounds. This work is concerned with the studies of two new semicarbazones, 2- formylpyridine-N4-phenylsemicarbazone (HL1) and 3-ethoxysalicylaldehyde- N4-phenylsemicarbazone (H2L2) and a reported semicarbazone
2-benzoylpyridine-N4-phenylsemicarbazone (HL3) [29]. The compositions of
these semicarbazones were determined by the CHN analyses and IR, UV and
NMR spectral studies were used for the characterization of these compounds.
The molecular structure of 3-ethoxysalicylaldehyde-N4-phenylsemicarbazone
(H2L2) was obtained by single crystal X-ray diffraction studies. Also, we have
synthesized Cu(II), Cd(II), Zn(II) and Ni(II) complexes of these three
semicarbazones. The complexes were characterized by various spectroscopic
techniques, magnetic and conductivity studies. We could isolate single crystals
of some complexes of all metals suitable for X-ray diffraction studies. This
thesis is divided into six chapters.
Description:
Department of Applied Chemistry, Cochin University of Science and Technology
Maheswaran Sithambaresan; Dr. M. R. Prathapachandra Kurup(Cochin University of Science and Technology, April 18, 2012)
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Abstract:
The work embodied in this thesis was carried out by the author in the
Department of Applied Chemistry, CUSAT, Kochi, during the period 2009-2012.
The thesis is an introduction to our attempts to evaluate the coordination behavior
of some compounds of our interest. The biological activities of semicarbazones
and their metal complexes have been an active area of research during the past
years because of their significant role in naturally occurring biological systems.
Tridentate NNO and ONO semicarbazone systems formed from heterocyclic and
aromatic carbonyl compounds and their transition metal complexes are wellauthenticated
compounds in this field and their synthesis, crystal structures and
spectral studies are well desirable. Hence, we decided to develop a research
program aimed at the syntheses, crystal structures and spectral studies of new N4-
phenylsemicarbazones derived from 2-formylpyridine and 3-ethoxysalicylaldehyde
and their transition metal complexes and new transition metal complexes of 2-
benzoylpyridine-N4-phenylsemicarbazone. In addition to various physicochemical
methods of analysis, single crystal X-ray diffraction studies were also
used for the characterization of the complexes.
Laly, K; Dr.Prathapachandra Kurup,M R(Cochin University of Science and Technology, July , 2011)
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Abstract:
In the present work,the chelating behaviour of thiosemicarbazones of a heterocyclic diketone, 2,6-diacetylpyridine is studied,with the aim of investigating the influence coordination exerts on their conformation and /or configuration, in connection with the nature of the metal and of the counter ion.The various possibilities like unsubstitution,ring incorporation at terminal nitrogen and condensation of one of the ketone group alone have been tried for ligand selection.Mainly first row transition metals like manganese,iron,nickel,copper,zinc and cadmium are studied.Metals like cobalt also were studied but could not result in fruitful isolation of the compound due to solubility problems.Different spectroscopic and characterization techniques have been utilized to reveal the nature of the metal and the ligands in coordinated metal complex.
Description:
Department of Applied Chemistry,Cochin University of Science and Technology
Bhoodes, R.K.; Dr. Francis C.A.(Cochin University of Science and Technology, November , 2014)
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Abstract:
Cashew is an important commodity traded across the continents and the
world cashew industry is the livelihood of more than three million people
worldwide, the majority of whom are womenfolk from the socially and
economically backward community of the developing nations. Cashew tree
was originally planted to prevent soil erosion and it was during the beginning
of the 19th century that cashew kernels attained the status of a food item.
Further, the cashew kernels attained the status of an international commodity
with India exporting its first consignment of cashew kernels to U.S.A. in 1920.
India was the first country to hit the world market with cashew as a
commodity and it was she who pioneered cashew processing as an industry.
For decades together India was enjoying a monopoly in the world cashew
industry in the fields of raw nut production (cultivation), processing and the
market share in the international trade. The liberalisation of international trade
has brought in a big transition in the world of cashew. India started to benefit
from the trade policy, that improved her supply positions of raw nuts from
other producing countries, accelerated her growth in processing of raw nuts
and exports of cashew kernels. On the other side, her domestic consumption
started growing up that by the beginning of the new century, she emerged out
as the world’s largest consumer of cashew kernels as well.
Philip,M P; George,K K(Department of Applied Economics, 2006)
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Abstract:
The study documents the long-term trends in financial intermediation by the principal player in Kerala’s credit system i.e., banking. The process of financial intermediation by the banking system, involving mobilization of deposits from savers and disbursal of credit to investors, is considered to be crucial in the process of economic development. The objective of the study is to explore the interrelationship between financial intermediation and economic growth in Kerala. In order to pursue this objective, the study examine, the trends in intermediation by the banking system in Kerala over a long period, the trend and pattern of bank deposits and credit in the State and Kerala’s economic growth, the trend in the growth and performance of financial intermediaries like the All India Financial Institutions, the links between banking and economic variables, and the difference in the growth trends of banking and economic variables between Kerala and India and the probable reasons for the difference
Mini, Kuriakose; Dr.Prathapachandra Kurup,M R(Cochin University of Science & Technology, December , 2006)
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Abstract:
The present work deals with the complexation of Schiff
bases of aroylhydrazides with various transition metal ions. The hydrazone
systems selected for study are capable of forming bridged polymeric structures
which is one of the fascinating subjects in the crystal engineering of coordination
polymers owing to their attractive new topologies and intriguing structural
features. Complexation with metal ions like copper, manganese, vanadium,
nickel, palladium, zinc and cadmium are tried. Various spectral techniques are
employed for characterization. The structures of some complexes have been well
established by single crystal X-ray diffraction studies.The work is presented in seven chapters and the last section deals with
summary and conclusion. The studies reveal that the aroylhydrazone systems vary
in their geometrical configuration depending on the substituents. The coordination
modes of the ligands also differ upon chelating with metal ions. One of the
hydrazone system selected for study proved that it could give rise to polymeric
metal complexes.
Description:
Dept.of Applied Chemistry,Cochin University of Science and Technology
Ratheesh Kumar, C S; Dr.Chandramohanakumar, N(Cochin University of Science and Technology, August , 2011)
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Abstract:
This thesis entitled triterpenoids as biomarkers of mangrove organic matter in cochin estuarine system.Mangrove forests, known as rainforests of the sea are one of the most important coastal ecosystems in the world in terms of primary production and coastal protection.Estuaries, the important areas of world’s coastal zones link the carbon cycle of the oceans to the continents.Three mangrove
ecosystems and three estuarine stations around Cochin region, southwest coast of India were selected for the present study. The thesis is divided into five chapters. Chapter 1 is the Introduction and it deals with the aim and scope of the present study. Chapter 2 is Materials and Methods. This chapter deals with the nature and general geographical features of the study area. It also contains the details of the sampling and analytical methodology.the present study. Chapter 3 is Geochemistry and it includes the seasonal and spatial variations of the geochemical parameters in the surface sediments.Chapter 4 is Biochemical Composition. It covers the biochemical composition of organic matter in the surface sediments to examine the quality and quantity of organic matter.Chapter 5, Triterpenoid Biomarkers in Sediments, characterize the organic matter in the sediments of the mangrove and estuarine ecosystems under study, to assess the possible sources with the help of triterpenoid biomarkers along with other lipid biomarkers.
Description:
Department of Chemical Oceanography, School of Marine Sciences, Cochin University of Science and Technology
Abhilash, S; Dr.Mohan Kumar, K(Cochin University of Science and Technology., December , 2007)
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Abstract:
The main purpose of the thesis is to improve the state of knowledge and understanding
of the physical structure of the TMCS and its short range prediction. The present
study principally addresses the fine structure, dynamics and microphysics of severe convective
storms.The structure and dynamics of the Tropical cloud clusters over Indian region is not well
understood. The observational cases discussed in the thesis are limited to the temperature
and humidity observations. We propose a mesoscale observational network along with all
the available Doppler radars and other conventional and non—conventional observations.
Simultaneous observations with DWR, VHF and UHF radars of the same cloud system will
provide new insight into the dynamics and microphysics of the clouds. More cases have to
be studied in detail to obtain climatology of the storm type passing over tropical Indian
region. These observational data sets provide wide variety of information to be assimilated
to the mesoscale data assimilation system and can be used to force CSRM.The gravity wave generation and stratosphere troposphere exchange (STE) processes
associated with convection gained a great deal of attention to modem science and meteorologist.
Round the clock observations using VHF and UHF radars along with supplementary
data sets like DWR, satellite, GPS/Radiosondes, meteorological rockets and aircrafl
observations is needed to explore the role of convection and associated energetics in detail.
Description:
Department of Atmospheric Sciences,
Cochin University of Science and Technology
Shaji,S; Abdul Rasheed, T M(Cochin University of Science and Technology, April , 2003)
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Abstract:
The present work is mainly concentrated on setting up a NIR tunable diode laser absorption (TDLA) spectrometer for high-resolution molecular spectroscopic studies. For successfully recording the high-resolution tunable diode laser spectrum, various experimental considerations are to be taken into account like the setup should be free from mechanical vibrations, sample should be kept at a low pressure, laser should be in a single mode operation etc. The present experimental set up considers all these factors. It is to be mentioned here that the setting up of a high resolution NIR TDLA spectrometer is a novel experiment requiring much effort and patience. The analysis of near infrared (NIR) vibrational overtone spectra of some substituted benzene compounds using local mode model forms another part of the present work. An attempt is made to record the pulsed laser induced fluorescence/Raman spectra of some organic compounds. A Q-switched Nd:YAG laser is used as the excitation source. A TRIAX monochromator and CCD detector is used for the spectral recording. The observed fluorescence emission for carbon disulphide is centered at 680 nm; this is assigned as due to the n, p* transition. Aniline also shows a broad fluorescence emission centered at 725 nm, which is due to the p,p* transition. The pulsed laser Raman spectra of some organic compounds are also recorded using the same experimental setup. The calibration of the set up is done using the laser Raman spectra of carbon tetrachloride and carbon disulphide. The observed laser Raman spectra for aniline, o-chloroaniline and m-chlorotoluene show peaks characteristics of the aromatic ring in common and the characteristics peaks due to the substitutuent groups. Some new peaks corresponding to low-lying vibrations of these molecules are also assigned