Monodisperse Pt NPs@rGO as highly efficient and reusable heterogeneous catalysts for the synthesis of 5-substituted 1H-tetrazole derivatives
Authors: İbrahim Esirden
Esma Erken
Muharrem Kaya
Fatih Sen
Journal: Catalysis Science & Technology (2015)
Discipline: CHEMISTRY
Keywords: Platinum nanoparticles; graphene oxide; heterogeneous catalysts; synthesis; tetrazoles
Affiliations: Chemistry Department, Faculty of Arts and Science, Dumlupınar University, Evliya Çelebi Campus, 43100 Kütahya, Biochemistry Department

Abstract: Monodisperse platinum nanoparticles supported on reduced graphene oxide (Pt NPs@rGO) are stable, isolable, bottleable, long-lived, highly efficient and exceptionally reusable heterogeneous catalysts for the synthesis of 5-substituted 1H-tetrazoles from sodium azide and various aromatic nitriles with great catalytic performance. Pt NPs@rGO have been used for the first time for these types of synthesis reactions and these NPs were characterized by transmission electron microscopy (TEM), high resolution electron microscopy (HRTEM), X-ray diffraction (XRD), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). All prepared tetrazole compounds were obtained with the highest yield by using the current heterogeneous catalyst and characterized by melting point, FT-IR, 1H-NMR, 13C-NMR and HRMS analyses.

Retracted: Yes

PubPeer comments:
 This paper appears to be one of a set of at least 2 papers by the same research group that both appear to share the same photo. In both papers, this photo is used as a high-resolution transmission electron microscopy (HRTEM) analysis of the  atomic lattice fringe and particle size of the nanoparticles. Of concern, the same photo is used to represent a different type of nanoparticle in each of these papers. The two papers that appear to be using the same photo are: * Betu00fcl u00c7elik et al. (2016) - DOI: 10.1039 c5cy01371b - Pt(0)@AC NPs ![file] * u0130brahim Esirden et al. (2015) - DOI: 10.1039 c5cy00864f - Pt@rGO NPs ![file] Of note, this is a different set of papers than the 30 papers by the same group that all appear to use another HRTEM image called  Inset 1 . For an example of that photo and the list of those 30 papers, see DOI 10.1016 j.ijhydene.2018.03.175 https: pubpeer.com publications 8AD71F4A32472314CCE9983D47E36F It is also a different set of papers than the 14 papers by the same group that all appear to use another HRTEM image called  Inset 2 . For an example of that photo and the list of those 14 papers, see DOI: 10.1016 j.ijhydene.2017.05.113 https: pubpeer.com publications CAD2F16435F6C639F5DE6851A2E61D , 
 Thanks for your interest to our articles in pubbeer. I have talked to my post docs related to this and they Will send me the original files. If they do not come with original files, then I will write the journal about the correction of article. Thanks again for your interest. I am so sorry for the case. I can guarentee that if there is a problem, it will be corrected... , 
 #2 Doctor u015een: Thank you for looking into this. You may wish to note that there are more papers with similar issues. It is hard to understand how this could occur over an extended period of time with different authors, so an explanation about the whole situation, in addition to addressing each paper, would be appreciated. A portion of this list is available here: https: pubpeer.com publications BB1C7BC9B0C4F55B2A3CBBD646087F This search may also assist your efforts: https: pubpeer.com search?q=%E2%80%9CFatih+%C5%9Een%E2%80%9D All the best , 
 Retraction, October 2021: https: pubs.rsc.org en content articlelanding 2021 cy d1cy90097h  u0130brahim Esirden and Muharrem Kaya hereby wholly retract this Catalysis Science Technology article due to concerns with the reliability of the data in the published article. Fig. 1, which is a high resolution TEM representing Pt NPs@rGO, has been reproduced as a scaled version in Fig. 2 in another Catalysis Science Technology article by Betu00fcl u00c7elik, Esma Erken, Sinan Eriu015f, Yunus Yu0131ldu0131z, Birgu00fctay u015eahin, Handan Pamuk and Fatih Sen,1 which is a high resolution TEM representing the Pt(0) TPA@AC catalyst. Fatih Sen claimed that this was a mistake and provided replacement data for consideration. However, an expert reviewed the authorsu2019 response and concluded that it did not satisfactorily address the concerns, and that the replacement figure did not fully support the conclusions. Given the significance of the concerns about the validity of the data, the findings presented in this paper are no longer reliable. Muharrem Kaya approves the retraction of this article due to concerns with the structural characterisation of the catalyst and therefore the conclusions presented may not be valid. Muharrem Kaya also states that the figures under question are out of their expertise and that they did not contribute to the data collection or processing of these figures. Muharrem Kaya contributed to the evaluation of the catalytic performances of the composite materials only. Fatih Sen opposes this retraction. Esma Erken was contacted but did not respond. Signed: u0130brahim Esirden and Muharrem Kaya Date: 23rd September 2021 Retraction endorsed by Maria Southall, Executive Editor, Catalysis Science Technology ,