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Abstract
Throughout this work, CuTCNQ thin films were prepared and investigated as an organometalic complex. CuTCNQ has special features that motivated the interest of researchers for years. It can be prepared at room temperature. It can be easily deposited in thin film form. CuTCNQ is a charge transfer material based on organic donor and acceptor. In addition CuTCNQ has the ability to be used as an electronic switch and memory device. CuTCNQ was prepared in thin film form utilizing chemical reaction deposition. It has been found that the characteristics of the deposited film significantly depend upon the reaction time. Despite the deposited films have single chemical formula C12N4H4Cu, it has been found that there are two types of the deposited films. Each type has its own characteristics which might differ from one to another. These two morphologies are assigned as phase 1 and phase 2. Phase 1 has been found to be physically different from phase 2. One of the problems encountered is having film with single phase. This seems to be the reason for the discrepancy and the inconsistence in the reported data about CuTCNQ. In this study films of single phase, either phase 1 or phase 2, have been synthesized. According to the spectroscopic investigation in the IR and UV ranges there was no significant difference between the two phases of the CuTCNQ. In addition, the main groups and bands of CuTCNQ have been assigned and detected for both phases. It is concluded that both phases of CuTCNQ have the same chemical formula, nearly the same bands and no significant shift was detected. However there is much difference between TCNQ and CuTCNQ. A strong shift of the position of some bands to higher wave number was detected as for C = C ring. Meanwhile most of the other bands shift to lower wave number. As a conclusion of that a confirmation of the existence of the Cu+(TCNQ)- - (TCNQ)o in both phases of CuTCNQ with a degree of charge transfer of the order 0.5.
Regarding the X-ray study, for the first time the diffraction pattern of both phases has been indexed. The indexing has also been performed for both phases at room temperature, at -100oC and at 90 oC. As a result of the X-ray analysis, the crystal structure of both phases at different temperatures has been extracted. Phase 1 and phase 2 at room temperature have the monoclinic and triclinic systems respectively.