Medical Imaging Technology

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Browsing Medical Imaging Technology by Author "Afnan Ribhee abdallah Mansour"

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    Synthesis and Study of Structure of Mixed-Ligand Mononuclear Coordination Compound of Copper, Nickel with 2,2'-Bipyrazine Ligand and Bidentate Nitrogenous Bases
    (Al-Quds University, 2023-05-20) Afnan Ribhee abdallah Mansour; افنان ربحي عبدالله منصور
    The construction of varied networks architectures has been accomplished by incorporating a variety of transition metal coordination geometries in ligand design. Nitrogen-based heterocycles represent a worthy example of ligands that react with metal ions, providing a significant role in the improvement of inorganic complexes and future synthetic works. There are series of new synthesized complexes that contain either copper(II) or nickel(II) metal atom with homoleptic and/or mixed-ligand as 2,2'-bipyrazine, 2,2'-dipyridylamine, 2-(aminomethyl)pyridine. The structures of the coordination compounds which are [Cu(amp)2(NO3)2] where amp: 2-(aminomethyl)pyridine), [(bpz)Cu(OH)(ClO4)-(H2O)]2.H2O, [Cu(bpz)3](ClO4)2.2CH3CN where bpz: 2,2'-bipyrazine, [Cu(dipyam)(H2O)-(pca)]ClO4 where dipyam: 2,2'-dipyridylamine, pca: 2-pyrazinecarboxylate, [Ni(dipyam)2-(bpz)](ClO4)2 and [Cu(bpz)2(H2O)](NO3)2 have been characterized based on several techniques as single crystal X-ray diffraction, FTIR spectroscopy and thermal analysis (DSC), and characterized in detail of ligands by FTIR spectroscopy. The Cu(II) atom in a new [Cu(amp)2(NO3)2] compound has six coordinated with four nitrogen atoms of 2-(aminomethyl)pyridine (amp) ligands, and with two oxygen atoms of the coordinated nitrate molecule. A distorted octahedral coordination geometry around copper Cu(II) atom. The crystal is monoclinic, with space group P21/c and the unit cell dimensions a = 8.6377 (7), b = 8.9833 (6), c = 9.9958 (8)A°, β = 99.430°, Z = 2 and V = 765.14 (10) A°3. The crystal packing is stabilized by C-H…O and N-H…O hydrogen bonds between the pyridine and amino groups of amp ligand with the oxygen atoms of coordinated nitrate molecule. The chains also are reinforced by C-H…O interactions between the CH group of the amp ligand and oxygen atom of nitrate ligand of neighboring chain. Adjacent Cu chains overlapping with others by π–π stacking interactions connecting by two 2-(aminomethyl)pyridine ligand. The structure of the dimer [(bpz)Cu(OH)(ClO4)(H2O)]2.H2O contains two separate centrosymmetric μ-hydroxy copper(II) dimers, with two terminal 2,2'-bipyrazine ligands, two molecules of water and two perchlorate groups and one water molecule as solvent molecule. The crystal are triclinic, with space group P-1 and the unit cell dimensions are a = 8.0391 (10), b = 8.1718 (9), c = 10.5662 (14)A°, α = 77.973 (5), β = 80.465 (6), γ = 84.271 (5)°, Z = 1 and V = 667.98 (14)A°3. The X-ray study shows that a distorted elongated tetragonal octahedral geometry around each copper(II) atom, where oxygen atoms of water and perchlorate particles located in the axial positions, while the two nitrogen atoms of 2,2'-bipyrazine ligand and two oxygen of the bridging hydroxo groups located in equatorial sites. The hydrogen bond are formed according to the nitrogens of pyrazine ligands, oxygen of perchlorate groups, hydroxide groups of coordinated water and crystallization water molecules. The X-ray study of the new compound [Cu(bpz)3](ClO4)2.2CH3CN conclude to that Cu(II) center has distorted octahedral geometry and the crystal is monoclinic, with space group P21/c and the unit cell dimensions a = 11.2508(6), b = 22.1602(12), c = 13.6980(8)A°, A = 90°, b = 90.302(5)°, g = 90°, Z = 4 and V = 3415.1(3) A°3. The crystal packing reveals different kinds of hydrogen bonds including, between acetonitrile and nitrogen atom of bpz ligands, oxygen atoms of perchlorate molecules, and hydrogen atom of bpz ligands and between hydrogen atom of acetonitrile and oxygen atom of perchlorate. Also, a Van Deer Waal interaction formed between the C-H of bpz with oxygen atom of ClO4. The adjacent sheets are interact through the π--π interaction. The in situ formed a new chelate [Cu(dipyam)(H2O)(pca)]ClO4 studied by X-ray and showed that Cu(II) atom has five coordinated by two nitrogen atoms of 2,2'-dipyridylamine, one nitrogen and one oxygen of 2-pyrazinecarboxylate (pca) ligand, one oxygen atom of coordinated water. The perchlorate molecule is a counter ion, A distorted square pyramid geometry around Cu(II) ion. The crystal is triclinic, with space group P-1 and the unit cell dimensions are a = 7.8943 (10), b = 9.9511 (14), c = 13.412 (2) A°, α = 98.908 (9), β = 106.079(8)°, γ = 112.715 (7)°, Z = 2 and V = 892.2 (2)A°3. The perchlorate anions bind the complex cations to produce a chain structure through O—H…O close contacts and C—H…O hydrogen bonds. The in situ forming of new ligand (pca) will encourage scientists to hypothesize a new methodology for C-C / C-N bond cleavage.The new divalent nickel chelate [Ni(dipyam)2(bpz)](ClO4)2, the X-ray structural analysis show that the Ni(II) atom is a hexacoordinated by two nitrogen atoms of 2,2'-bipyrazine ligand, and four nitrogen atoms of two 2,2'-dipyridylamine ligands. The two perchlorate ion is a counter ion. The geometry of the compound is a distorted octahedral because of existing the three chelate rings binds with Ni(II) metal, including two (dipyam), one 2,2'-bipyrazine ligands, each 2,2'-dipyridylamine located at equatorial plane and at axial position, and 2,2'-bipyrazine ligands located at equatorial positions. The crystal structure is monoclinic, with space group C2/c the unit cell dimensions are a = 16.919 (3), b = 11.2635 (18), c = 17.588 (4)A°, β = 113.037 (4)°, Z = 4 and V= 3084.4 (10)A°3.The perchlorate anions link the complex cations to form a chain structure through N—H…O close contacts and C—H…O hydrogen bonds, beside to 2,2'-bipyrazine ligand binds through C—H•••N. The π•••π and/or C-H•••π interactions that established by aromatic rings of pyridyl and pyrazinyl groups from adjacent sheet.The new [Cu(bpz)2(H2O)](NO3)2 complex investigated by X-ray analysis to find that Cu(II) atom is five coordinated with four nitrogen atoms of 2,2'-bipyrazine ligands, and with one oxygen atom of the water molecule. The two nitrate molecules as counter ion. A distorted trigonal bipyramidal geometry around copper Cu(II) atom. The crystal is Monoclinic, with space group C2/c and the unit cell dimensions a = 15.886 (6), b = 7.208 (4), c = 18.016 (7)A°,β = 107.07 (4), Z = 4 and V = 1972.2 (17)A°3.The crystal packing is stabilized by hydrogen bond that formed according to nitrate anions which is acting as bridges to bond with the cations of the complex via O—H…N and O—H…O hydrogen bonds and C—H…O closed contacts. These complexes may be able to play role in different fields either chemical, biological or electrical studies due to their ligands have expanded using in multi applications, for example, using in development of selective catalysis, preparation of supramolecular compounds, designing of pharmaceutical molecules that used in drug discovery studies, beside to their utilizing in electro-optic materials, semiconductor materials and magnetic materials.