%0 Journal Article %1 ISI:000358299700027 %A Alemohammad, Tahereh %A Safari, Nasser %A Rayati, Saeed %A Gheidi, Mahin %A Mortazavimanesh, Anahita %A Khavasi, Hamidreza %C PO BOX 564, 1001 LAUSANNE, SWITZERLAND %D 2015 %I ELSEVIER SCIENCE SA %J INORGANICA CHIMICA ACTA %K Catalytic Hydrogen Porphyrin bonding; cyclic epoxidation; porphyrins; voltammetry} {Platinum(IV) %P 198-208 %R 10.1016/j.ica.2015.05.023 %T Hydrogen bond controlled formation of trans-dihydroxo porphyrinato platinum(IV) complexes: Synthesis, characterization and catalytic activity in olefin epoxidation %V 434 %X A number of trans-dihydroxo porphyrinato platinum(IV) complexes, (porp)Pt-IV(OH)(2) have been synthesized and characterized from their platinum(II)-porphyrin precursors by spectroscopic methods. The crystal structure of the platinum complex of trans-dihydroxo-meso-tetramesitylporphyrinato platinum(IV) meta-chlorobenzoic acid ((TMP)Pt-IV(OH)(2)(m-CBA)(2)) has also been determined. The porphyrin periphery is planar and the platinum atom has a slightly distorted octahedral environment. It must be noted that there is a very strong O-H . . . O hydrogen bond between the hydrogen atoms of mchlorobenzoic acids and the two hydroxo ligands coordinated to the platinum center. This crystal structure has been previously described by us as trans-dihydroxo-meso-tetramesitylporphyrinato platinum(VI) meta-chlorobenzoate ((TMP)Pt-VI(OH)(2)(m-CB)(2)), but the spectroscopic data has been reinterpreted due to the contradictory +6 oxidation state for platinum. The UV-Vis and NMR spectroscopic data suggest that the porphyrin skeleton is similar to that of normal porphyrins and are also indicative of the +4 oxidation state for platinum. Cyclic voltammetry studies also indicate that PtIITMP can oxidize up to Pt-IV(TMP+.) species via three successive one-electron oxidation steps. The results of DFT studies and NBO analysis confirm that platinum has +4 oxidation state in both (TMP) Pt(OH)(2)(m-CBA)(2) and (TMP)Pt(OH)(2)(m-CB)(2) complexes. The catalytic activity of these porphyrin complexes has been investigated for the oxidation of various alkenes in the presence of iodosylbenzene. (C) 2015 Elsevier B.V. All rights reserved.

@article{ISI:000358299700027, abstract = {{A number of trans-dihydroxo porphyrinato platinum(IV) complexes, {[}(porp)Pt-IV(OH)(2)] have been synthesized and characterized from their platinum(II)-porphyrin precursors by spectroscopic methods. The crystal structure of the platinum complex of trans-dihydroxo-meso-tetramesitylporphyrinato platinum(IV) meta-chlorobenzoic acid ({[}(TMP)Pt-IV(OH)(2)](m-CBA)(2)) has also been determined. The porphyrin periphery is planar and the platinum atom has a slightly distorted octahedral environment. It must be noted that there is a very strong O-H . . . O hydrogen bond between the hydrogen atoms of mchlorobenzoic acids and the two hydroxo ligands coordinated to the platinum center. This crystal structure has been previously described by us as trans-dihydroxo-meso-tetramesitylporphyrinato platinum(VI) meta-chlorobenzoate ({[}(TMP)Pt-VI(OH)(2)](m-CB)(2)), but the spectroscopic data has been reinterpreted due to the contradictory +6 oxidation state for platinum. The UV-Vis and NMR spectroscopic data suggest that the porphyrin skeleton is similar to that of normal porphyrins and are also indicative of the +4 oxidation state for platinum. Cyclic voltammetry studies also indicate that PtIITMP can oxidize up to Pt-IV(TMP+.) species via three successive one-electron oxidation steps. The results of DFT studies and NBO analysis confirm that platinum has +4 oxidation state in both {[}(TMP) Pt(OH)(2)](m-CBA)(2) and {[}(TMP)Pt(OH)(2)](m-CB)(2) complexes. The catalytic activity of these porphyrin complexes has been investigated for the oxidation of various alkenes in the presence of iodosylbenzene. (C) 2015 Elsevier B.V. All rights reserved.}}, added-at = {2017-05-10T15:29:29.000+0200}, address = {{PO BOX 564, 1001 LAUSANNE, SWITZERLAND}}, affiliation = {{Safari, N (Reprint Author), Shahid Beheshti Univ, Dept Chem, GC, POB 1983963113, Tehran, Iran. Alemohammad, Tahereh; Safari, Nasser; Gheidi, Mahin; Mortazavimanesh, Anahita; Khavasi, Hamidreza, Shahid Beheshti Univ, Dept Chem, GC, Tehran, Iran. Rayati, Saeed, KN Toosi Univ Technol, Dept Chem, Tehran 15418, Iran.}}, author = {Alemohammad, Tahereh and Safari, Nasser and Rayati, Saeed and Gheidi, Mahin and Mortazavimanesh, Anahita and Khavasi, Hamidreza}, author-email = {{n-safari@sbu.ac.ir}}, biburl = {https://www.bibsonomy.org/bibtex/225f0e7714939e30be640bee8c4635166/hkhavasi}, cited-references = {{Aghabali A, 2010, J PORPHYR PHTHALOCYA, V14, P335, DOI 10.1142/S1088424610002136. Alemohammad T, 2011, J PORPHYR PHTHALOCYA, V15, P181, DOI 10.1142/S1088424611003094. Anderson TM, 2004, SCIENCE, V306, P2074, DOI 10.1126/science.1104696. 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Toosi University of Technology}}, funding-text = {{We would like to thank the Graduate Study Councils of Shahid Beheshti University and K.N. Toosi University of Technology for financial support.}}, interhash = {63ac6e48df8466c0630b4640de450f73}, intrahash = {25f0e7714939e30be640bee8c4635166}, issn = {{0020-1693}}, journal = {{INORGANICA CHIMICA ACTA}}, journal-iso = {{Inorg. Chim. Acta}}, keywords = {Catalytic Hydrogen Porphyrin bonding; cyclic epoxidation; porphyrins; voltammetry} {Platinum(IV)}, keywords-plus = {{SUBSTITUTED PORPHYRINS; MANGANESE PORPHYRINS; METAL-COMPLEXES; REACTIVITY; LIGAND; METALLOPORPHYRINS; IRON(III); OXYGEN; TETRAPHENYLPORPHYRIN; ELECTROCHEMISTRY}}, language = {{English}}, month = {{AUG 1}}, number-of-cited-references = {{71}}, pages = {{198-208}}, publisher = {{ELSEVIER SCIENCE SA}}, research-areas = {{Chemistry}}, times-cited = {{6}}, timestamp = {2017-05-10T15:29:29.000+0200}, title = {{Hydrogen bond controlled formation of trans-dihydroxo porphyrinato platinum(IV) complexes: Synthesis, characterization and catalytic activity in olefin epoxidation}}, type = {{Article}}, unique-id = {{ISI:000358299700027}}, usage-count-last-180-days = {{6}}, usage-count-since-2013 = {{22}}, volume = {{434}}, web-of-science-categories = {{Chemistry, Inorganic \& Nuclear}}, year = {{2015}} }