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Okumuş A, Elmas G, Kılıç Z, Gönder LY, Açık L. Phosphorus-nitrogen compounds. Part 67. The reactions of Mono/bis (4-fluorobenzyl)spiro(N/N)cyclotriphosphazenes with sodium(3-amino-1-propanoxide): investigation of spectral properties, DNA-cleavage and antimicrobial activities. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2022.2145477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Aytuğ Okumuş
- Department of Chemistry, Ankara University, Ankara, Turkey
| | - Gamze Elmas
- Department of Chemistry, Ankara University, Ankara, Turkey
| | - Zeynel Kılıç
- Department of Chemistry, Ankara University, Ankara, Turkey
| | | | - Leyla Açık
- Department of Biology, Gazi University, Ankara, Turkey
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Elmas G, Binici A, Özgür M, Okumuş A, Kılıç Z, Çoşut B, Hökelek T, Çerçi NA, Açık L. Phosphorus-Nitrogen Compounds. Part 64. Comparative Reactions of Spiro and Ansa(N/O) Cyclotetraphosphazenes with Bulky (4-Fluorobenzyl) N/N and N/O Donor Type Bidentate Reagents: Structure, Stereogenic Properties and Cytotoxic activity Studies. NEW J CHEM 2022. [DOI: 10.1039/d2nj02280j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of octachlorocyclotetraphosphazene, N4P4Cl8 (1) (OCCP, tetramer) with an equimolar amount of sodium 3-(N-ferrocenylmethylamino)-1-propanoxide (L1) resulted in the formations of ferrocenyl-spiro-(2) and ferrocenyl-2-cis-4-dichloro-ansa-(3) cyclotetraphosphazenes. Both of the starting compounds...
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Tümer Y, Asmafiliz N, Kılıç Z, Hökelek T. Phosphorus–nitrogen compounds: part 63. Mono- and bis-vanillinatobisferrocenyldispiro( N/ N)cyclotriphosphazenes and their macrocyclic Schiff-bases: synthesis, structural characterization and isomerism. NEW J CHEM 2022. [DOI: 10.1039/d2nj00846g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Mono/bis-vanillinato ferrocenyldispirocyclotriphosphazenes and Schiff-bases were obtained. Structures of the compounds were determined using spectroscopic methods. Absolute configurations of three compounds were defined by X-ray crystallography.
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Affiliation(s)
- Yasemin Tümer
- Department of Chemistry, Karabük University, 78050 Karabük, Turkey
| | - Nuran Asmafiliz
- Department of Chemistry, Ankara University, 06100 Ankara, Turkey
| | - Zeynel Kılıç
- Department of Chemistry, Ankara University, 06100 Ankara, Turkey
| | - Tuncer Hökelek
- Department of Physics, Hacettepe University, 06800 Beytepe, Ankara, Turkey
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Phosphorus–nitrogen compounds Part 55. Syntheses of 4-methoxybenzylspiro(N/N)cyclotriphosphazenes: chemical, structural and biological properties. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-021-04505-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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İşcan Ö, Cemaloğlu R, Asmafiliz N, Zeyrek CT, Kılıç Z, Açık L, Aydın B, Türk M, Hökelek T. Phosphorus-nitrogen compounds: part 53-synthesis, characterization, cytotoxic and antimicrobial activity, DNA interaction and molecular docking studies of new mono- and dispirocyclotriphosphazenes with pendant arm(s). Mol Divers 2021; 26:1077-1100. [PMID: 33988806 DOI: 10.1007/s11030-021-10231-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 05/05/2021] [Indexed: 10/21/2022]
Abstract
Mono-/dispirocyclotriphosphazenes with pendant arm(s) are robust, but they are less investigated inorganic ring systems. In this study, a series of mono (3 and 4)- and dispirocyclotriphosphazenes with 4-chloro-benzyl pendant arm(s) (13-16) was obtained from the Cl exchange reactions of hexachlorocyclotriphosphazene with sodium (N-benzyl)aminopropanoxides (1 and 2). When compound (3) reacted with excess pyrrolidine, morpholine, tetra-1,4-dioxa-8-azaspiro[4,5]decane (DASD) and piperidine, the fully substituted monospirocyclotriphosphazenes (7, 9, 10 and 12) occurred. But, the reactions of 4 with excess piperidine and morpholine produced the gem-piperidino (5)- and morpholino (6)-substituted monospirocyclotriphosphazenes, whereas the reactions of 4 with excess pyrrolidine and DASD gave the fully substituted monospirocyclotriphosphazenes (8) and (11). However, it should be indicated that these derivatives were obtained to be used for the investigation of their spectral, stereogenic and biological properties. The structures of 5, 7 and 14 were determined crystallographically. X-ray data of 5 and 14 displayed that both of compounds were chiral in solid state, and their absolute configurations were assigned as R and RR. Additionally, the antimicrobial activities of phosphazenes were investigated. Minimum inhibitory concentrations, minimal bacterial concentrations and minimum fungicidal concentrations of phosphazenes were determined. The interactions of phosphazenes with plasmid DNA were evaluated by agarose gel electrophoresis. The cytotoxic activities of compounds were studied against L929 fibroblast and DLD-1 colon cancer cells. In addition, density functional theory calculations of 5, 7 and 14 were reported, and their molecular docking studies with DNA, E. coli DNA gyrase and topoisomerase IV were presented.
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Affiliation(s)
- Özlem İşcan
- Department of Chemistry, Ankara University, 06100, Ankara, Turkey.,Project and Technology Office, Bartın University, 74100, Bartın, Turkey
| | - Reşit Cemaloğlu
- Department of Chemistry, Ankara University, 06100, Ankara, Turkey
| | - Nuran Asmafiliz
- Department of Chemistry, Ankara University, 06100, Ankara, Turkey.
| | - Celal Tuğrul Zeyrek
- Department of Academy and Publication, Turkish Energy, Nuclear and Mining Research Institution, 06100, Ankara, Turkey
| | - Zeynel Kılıç
- Department of Chemistry, Ankara University, 06100, Ankara, Turkey
| | - Leyla Açık
- Department of Biology, Gazi University, 06500, Ankara, Turkey
| | - Betül Aydın
- Department of Biology, Gazi University, 06500, Ankara, Turkey
| | - Mustafa Türk
- Department of Bioengineering, Kırıkkale University, 71450, Yahşihan, Kırıkkale, Turkey
| | - Tuncer Hökelek
- Department of Physics, Hacettepe University, 06800, Ankara, Turkey
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Tada Y, Sunada A, Watanabe R, Kanazawa M, Utsumi K. Synthesis of Trispirocyclotriphosphazenes with Oxaphosphorine Rings and Their Crystal and Molecular Structures. Inorg Chem 2021; 60:5014-5020. [PMID: 33733777 DOI: 10.1021/acs.inorgchem.1c00054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Novel trispirocyclotriphosphazenes with oxaphosphorine rings (DOP-PZs) were successfully synthesized by an Appel reaction with phosphoramide, which was prepared from ammonia and 10-chloro-9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide derived from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, generally abbreviated as DOPO. The resulting DOP-PZs were characterized by 1H, 13C{1H}, and 31P{1H} nuclear magnetic resonance spectroscopy and time-of-flight mass spectrometry and shown to consist of cis-trans isomers. Moreover, the crystal and molecular structures of the DOP-PZs were determined by X-ray diffraction; cis- and trans-DOP-PZs (C36H24N3O3P3, M = 639.49 g/mol) were refined to final R1 values of 0.0260 and 0.0463, respectively, with the SHELXL refinement package using least-squares minimization. The crystal of cis-DOP-PZ is trigonal in space group R3c and the following cell constants: a = 19.5984(5) Å, c = 13.2754(4) Å, V = 4415.9(3) Å3, Z = 6, and Flack parameter = 0.038(8). In contrast, trans-DOP-PZ is monoclinic in space group P21/c and the following cell constants: a = 9.98647(18) Å, b = 24.1737(4) Å, c = 12.8472(2) Å, β = 112.649(8)°, V = 2862.26(18) Å3, and Z = 4. The molecular structures of these DOP-PZs were compared with those of other trispirocyclotriphosphazenes. In addition, the DOP-PZs showed high thermal stability up to 400 °C, with dielectric constants of 2.76-2.77 and dissipation factors of 0.0017-0.0031 at 10 GHz.
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Affiliation(s)
- Yuji Tada
- Research and Development Department, Fushimi Pharmaceutical Company, Ltd., Marugame 763-8605, Japan
| | - Atsushi Sunada
- Research and Development Department, Fushimi Pharmaceutical Company, Ltd., Marugame 763-8605, Japan
| | - Riki Watanabe
- Research and Development Department, Fushimi Pharmaceutical Company, Ltd., Marugame 763-8605, Japan
| | - Makoto Kanazawa
- Research and Development Department, Fushimi Pharmaceutical Company, Ltd., Marugame 763-8605, Japan
| | - Keiichiro Utsumi
- Research and Development Department, Fushimi Pharmaceutical Company, Ltd., Marugame 763-8605, Japan
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Okumuş A, Elmas G, Kılıç Z, Binici A, Ramazanoğlu N, Açık L, Çoşut B, Hökelek T, Güzel R, Tunalı BÇ, Türk M, Şimşek H. The comparative reactions of 2‐
cis
‐4‐ansa and spiro cyclotetraphosphazenes with difunctional ligands: Structural and stereogenic properties, electrochemical, antimicrobial and cytotoxic activity studies. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6150] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Aytuğ Okumuş
- Department of Chemistry Ankara University Ankara Turkey
| | - Gamze Elmas
- Department of Chemistry Ankara University Ankara Turkey
| | - Zeynel Kılıç
- Department of Chemistry Ankara University Ankara Turkey
| | - Arzu Binici
- Republic of Turkey Ministry of Health Ankara Turkey
| | | | - Leyla Açık
- Department of Biology Gazi University Ankara Turkey
| | - Bünyemin Çoşut
- Department of Chemistry Gebze Technical University Gebze‐Kocaeli Turkey
| | - Tuncer Hökelek
- Department of Physics Hacettepe University Ankara Turkey
| | - Remziye Güzel
- Department of Chemistry Dicle University Diyarbakır Turkey
| | | | - Mustafa Türk
- Department of Bioengineering Kırıkkale University Yahşihan‐Kırıkkale Turkey
| | - Hülya Şimşek
- Department of Microbiology Bozok University Yozgat Turkey
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Mutlu ÖF, Binici A, Okumuş A, Elmas G, Çoşut B, Kılıç Z, Hökelek T. Phosphorus–nitrogen compounds. Part 54. syntheses of chiral amino-4-fluorobenzyl-spiro(N/O)cyclotriphosphazenes: structural and stereogenic properties. NEW J CHEM 2021. [DOI: 10.1039/d1nj00934f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Syntheses, spectral and crystallographic characterizations and stereogenic properties by 31P NMR spectra recorded with the addition of CSA, CD spectra and chiral HPLC of amino-4-fluorobenzylspiro(N/O)cyclotriphosphazenes were examined.
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Affiliation(s)
| | - Arzu Binici
- Republic of Turkey Ministry of Health
- 06100 Ankara
- Turkey
| | - Aytuğ Okumuş
- Department of Chemistry
- Ankara University
- 06100 Ankara
- Turkey
| | - Gamze Elmas
- Department of Chemistry
- Ankara University
- 06100 Ankara
- Turkey
| | - Bünyemin Çoşut
- Department of Chemistry
- Gebze Technical University
- 41400 Gebze-Kocaeli
- Turkey
| | - Zeynel Kılıç
- Department of Chemistry
- Ankara University
- 06100 Ankara
- Turkey
| | - Tuncer Hökelek
- Department of Physics
- Hacettepe University
- 06800 Ankara
- Turkey
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Kajiyama K, Iwanami J, Yuge H. Efficient Synthesis of Cyclotriphosphazene Tripodal Tridentate Ligand via the Copper(I)-Template Method. HETEROCYCLES 2021. [DOI: 10.3987/com-21-14540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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N,N-Spiro bridged bis(cyclotriphosphazene) derivatives with four equivalent chiral centres: Synthesis, characterization and stereogenic properties. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.119093] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Phosphorus-nitrogen compounds. Part 52. The reactions of octachlorocyclotetraphosphazene with sodium 3-(N-ferrocenylmethylamino)-1-propanoxide: Investigations of spectroscopic, crystallographic and stereogenic properties. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.119106] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Asmafiliz N, Berberoğlu İ, Özgür M, Kılıç Z, Kayalak H, Açık L, Türk M, Hökelek T. Phosphorus-nitrogen compounds: Part 46. The reactions of N3P3Cl6 with bidentate and monodentate ligands: The syntheses, structural characterizations, antimicrobial and cytotoxic activities, and DNA interactions of (N/N)spirocyclotriphosphazenes with 4-chlorobenzyl pendant arm. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.05.048] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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İnci Tanrıkulu G, Yakut Özgür M, Okumuş A, Kılıç Z, Hökelek T, Aydın B, Açık L. Phosphorus-Nitrogen compounds part 47: The conventional and microwave-assisted syntheses of dispirocyclotriphosphazene derivatives with (4-fluoro/4-nitrobenzyl) pendant arms: Structural and stereogenic properties and DNA interactions. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.03.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Phosphorus-nitrogen compounds: Part 45. Vanillinato-substituted cis- and trans-bisferrocenyldispirocyclotriphosphazenes: Syntheses, spectroscopic and crystallographic characterizations. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.12.090] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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15
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Elmas G. Syntheses and structural characterizations of 2-pyridyl(N/O)spirocyclotriphosphazene derivatives. PHOSPHORUS SULFUR 2019. [DOI: 10.1080/10426507.2018.1469490] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Gamze Elmas
- Department of Chemistry, Ankara University, Ankara, Turkey
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16
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Öztürk E, Okumuş A, Kılıç Z, Kılıç A, Kayalak H, Açık L, Aytuna Çerçi N, Türk M, Hökelek T. Phosphorus-nitrogen compounds. Part 44. The syntheses of N,N-spiro bridged cyclotriphosphazene derivatives with (4-fluorobenzyl) pendant arms: Structural and stereogenic properties, DNA interactions, antimicrobial and cytotoxic activities. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2018.10.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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17
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Binici A, Okumuş A, Elmas G, Kılıç Z, Ramazanoğlu N, Açık L, Şimşek H, Çağdaş Tunalı B, Türk M, Güzel R, Hökelek T. Phosphorus–nitrogen compounds. Part 42. The comparative syntheses of 2-cis-4-ansa(N/O) and spiro(N/O) cyclotetraphosphazene derivatives: spectroscopic and crystallographic characterization, antituberculosis and cytotoxic activity studies. NEW J CHEM 2019. [DOI: 10.1039/c9nj00577c] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Syntheses, structural properties and biological activities of ferrocenyl ansa- and spiro-cyclotetraphosphazenes were investigated.
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Affiliation(s)
- Arzu Binici
- Turkey's Health Ministry General Directorate of Public Health
- 06100 Ankara
- Turkey
| | - Aytuğ Okumuş
- Department of Chemistry
- Ankara University
- 06100 Tandoğan-Ankara
- Turkey
| | - Gamze Elmas
- Department of Chemistry
- Ankara University
- 06100 Tandoğan-Ankara
- Turkey
| | - Zeynel Kılıç
- Department of Chemistry
- Ankara University
- 06100 Tandoğan-Ankara
- Turkey
| | | | - Leyla Açık
- Department of Biology
- Gazi University
- 06500 Ankara
- Turkey
| | - Hülya Şimşek
- Faculty of Medicine
- Bozok University
- 66900 Yozgat
- Turkey
| | | | - Mustafa Türk
- Department of Bioengineering
- Kırıkkale University
- 71450 Kırıkkale
- Turkey
| | - Remziye Güzel
- Department of Chemistry
- Dicle University
- Diyarbakır
- Turkey
| | - Tuncer Hökelek
- Department of Physics
- Hacettepe University
- 06800 Ankara
- Turkey
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Phosphorus-nitrogen compounds: Part 43. Syntheses, spectroscopic characterizations and antimicrobial activities of cis- and trans-N/O dispirocyclotriphosphazenes containing ferrocenyl pendant arms. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.07.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Asmafiliz N, Civan M, Uzunalioğlu N, Özben A, Kiliç Z, Kayalak H, Açik L, Hökelek T. Phosphorus–nitrogen compounds. Part 41. Ferrocenyl pendant-armed spirocyclopiperidinocyclotriphosphazatrienes: Langmuir–Blodgett thin films and biological activity studies. J CHEM SCI 2018. [DOI: 10.1007/s12039-018-1545-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Elmas G, Okumuş A, Kılıç Z, Çam M, Açık L, Hökelek T. Phosphorus-nitrogen compounds. Part 40. The syntheses of (4-fluorobenzyl) pendant armed cyclotetraphosphazene derivatives: Spectroscopic, crystallographic and stereogenic properties, DNA interactions and antimicrobial activities. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.02.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Tümer Y, Asmafiliz N, Zeyrek CT, Kılıç Z, Açık L, Çelik SP, Türk M, Çağdaş Tunalı B, Ünver H, Hökelek T. Syntheses, spectroscopic and crystallographic characterizations of cis- and trans-dispirocyclic ferrocenylphosphazenes: molecular dockings, cytotoxic and antimicrobial activities. NEW J CHEM 2018. [DOI: 10.1039/c7nj03643d] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The crystallographic and molecular docking investigations and the determinations of the cytotoxic activities of the dispirocyclic ferrocenylphosphazenes were performed.
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Affiliation(s)
- Yasemin Tümer
- Department of Chemistry
- Karabük University
- 78050 Karabük
- Turkey
| | | | - C. Tuğrul Zeyrek
- Department of Training and Application
- Ankara Nuclear Research and Training Center
- Turkish Atomic Energy Authority
- TR-06100 Beşevler
- Turkey
| | - Zeynel Kılıç
- Department of Chemistry
- Ankara University
- 06100 Ankara
- Turkey
| | - Leyla Açık
- Department of Biology
- Gazi University
- 06500 Ankara
- Turkey
| | | | - Mustafa Türk
- Department of Bioengineering
- Kırıkkale University
- 71450 Yahşihan-Kırıkkale
- Turkey
| | - B. Çağdaş Tunalı
- Department of Bioengineering
- Kırıkkale University
- 71450 Yahşihan-Kırıkkale
- Turkey
| | - Hüseyin Ünver
- Department of Physics
- Faculty of Sciences
- Ankara University
- Beşevler
- Turkey
| | - Tuncer Hökelek
- Department of Physics
- Hacettepe University
- 06800 Ankara
- Turkey
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Elmas G, Okumuş A, Cemaloğlu R, Kılıç Z, Çelik SP, Açık L, Tunalı BÇ, Türk M, Çerçi NA, Güzel R, Hökelek T. Phosphorus-nitrogen compounds. part 38. Syntheses, characterizations, cytotoxic, antituberculosis and antimicrobial activities and DNA interactions of spirocyclotetraphosphazenes with bis-ferrocenyl pendant arms. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.10.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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