Synthesis, spectroscopic and computational analysis of nickel integrated germanium clusters

Öğün, Sinem Esra
Nanomaterials are attracting great deal of attention due to their wide range of applications such as in medicine, catalysis and electronics. The use of clusters either as seeds to synthesize larger molecular clusters or in assembled cluster materials is a promising way to prepare new nanomaterials. In particular, the possibility of clusters serving molecular control to design and tuning their properties to fit a particular application makes them more attractive in the search of new advanced materials. Therefore, besides synthesis of new cluster materials, the characterization and understanding of their unique properties is one of the major goals of cluster science. Polyatomic main group clusters (Zintl ions) are great candidates to be used as “building-blocks” to prepare new cluster materials and they embody the potential to be used in applications such as bimetallic catalysis, photovoltaic devices, and light - emitting diodes. In this study, nickel (Ni) integrated germanium (Ge) Zintl ion clusters (i.e. [Ni2Ge9(PPh3)]2-, [Ni6Ge13(CO)5]4-) have been synthesized. The experimental characterization of spectroscopic properties, which have never been investigated before, has been performed. Vibrational, optical and electronic properties of Ni-Ge clusters have been investigated via UV-Vis, FTIR and Fluorescence spectroscopy. Moreover, frequency and time-dependent (TD) electronic transition calculations have been performed to complement the experimental results. The spectroscopic and computational findings are believed to contribute to the understanding and evaluation of cluster properties for their potential future applications.


Synthesis, aqueous solution behavior and layer-bylayer self-assembly of poly(2-alkyl-2-oxazoline)s
Çağlı, Eda; Erel Göktepe, İrem; Department of Chemistry (2019)
Poly(2-alkyl-2-oxazoline)s (PAOXs), are of interest for biomedical applications due to their important biological properties such as nontoxicity and biocompatibility. PAOXs with short-alkyl chains exhibit temperature-responsive behaviour which is advantageous for various biomedical applications. This dissertation focused on synthesis, aqueous solution behaviour, post-functionalization and layer-by-layer (LbL) self-assembly of PAOXs. In addition, it aimed to examine the surface properties of PAOX LbL films a...
Synthesis, functionalization and characterization of gold nanoparticles
Sholanbayeva, Zhanar; Nalbant Esentürk, Emren; Durucan, Caner; Department of Micro and Nanotechnology (2012)
Metallic nanoparticles (NPs) with various elemental composition, size, shape and physical or chemical properties has become active field of research. Among all the metal NPs noble metal ones are receiving much attention due to their special optical properties which make them useful for different applications. Noble metal NPs have bright colors resulting from strong surface plasmon resonance absorption usually in the visible region. The colors are size and shape dependent and provide the tuning of optical pr...
Preparation and characterization of hydrogen-bonded layer-by-layer polymer films containing magnetic nanoparticles
Khan, Muhammad Alyaan Ahmed; Erel Göktepe, İrem; Department of Polymer Science and Technology (2014)
Stimuli responsive layer-by-layer (LbL) polymer films are promising materials as platforms for controlled release of functional biological molecules such as drugs, proteins, growth hormones, etc. from surfaces. Recently, there has been a growing interest for preparation of LbL polymer platforms containing superparamagnetic iron oxide nanoparticles for dual functionality, i.e. bioimaging and controlled delivery of biological molecules. Moreover, if superparamagnetic iron oxide nanoparticles are embedded into...
Adsorption of blood proteins on glow-discharge-modified polyurethane membranes
Kayirhan, N; Denizli, A; Hasırcı, Nesrin (2001-08-08)
Polyurethanes are a class of polymers that have a wide range of applications in the medical field although their blood compatibility still needs improvement. In order to obtain medical purity, this study prepared membrane-form polyurethanes from toluene 2,4-diisocyanate (TDI) and poly(propylene ethylene glycol) without the addition of any ingredients such as solvents, catalysts, or chain extenders. The aim was to increase surface hydrophilicity and improve blood compatibility. Therefore, the prepared membra...
Synthesis and characterization of nickel based bulk amkorphous alloys
Arslan, Hülya; Mekhrabov, Amdulla O.; Department of Metallurgical and Materials Engineering (2004)
The aim of this study is to synthesize and characterize new bulk amorphous alloys in the Ni- based systems. Theoretical studies on the basis of semi-empirical rules and the electronic theory of alloys in pseudopotential approximation has been provided in order to predict the impurity elements that will lead to an increase in the glass forming ability of Ni-based alloy systems. Glass forming ability of ten different compositions of alloys of Ni-Nb, Ni-Fe, Ni-B, Ni-Hf and Ni-Cr was simulated by using FORTRAN ...
Citation Formats
S. E. Öğün, “Synthesis, spectroscopic and computational analysis of nickel integrated germanium clusters,” M.S. - Master of Science, Middle East Technical University, 2014.