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April 26, 2021
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Synthesis and characterization of new Pd(ii) and Pt(ii) complexes with 3-substituted 1-(2-pyridyl)imidazo[1,5-a]pyridine ligands

Publicated to: Dalton Transactions. 50 (14): 4859-4873 - 2021-04-14 50(14), DOI: 10.1039/d1dt00546d

Authors: Pischedda, Sara; Stoccoro, Sergio; Zucca, Antonio; Sciortino, Giuseppe; Ortu, Fabrizio; Clarkson, Guy J

Affiliations

Consorzio Interuniv Reatt Chim & Catalisi CIRCC, Bari, Italy - Author
Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC) - Author
Inst Chem Res Catalonia ICIQ, Av Paisos Catalans 16, Tarragona 43007, Spain - Author
Institut Català d’Investigació Química - Author
The University of Manchester - Author
Univ Leicester, Sch Chem, Univ Rd, Leicester LE1 7RH, Leics, England - Author
Univ Manchester, Dept Chem, Oxford Rd, Manchester M13 9PL, Lancs, England - Author
Univ Sassari, Dipartimento Chim & Farm, Via Vienna 2, I-07100 Sassari, Italy - Author
Univ Warwick, Dept Chem, Gibbet Hill Rd, Coventry CV4 7AL, W Midlands, England - Author
Universita degli Studi di Sassari - Author
University of Leicester - Author
University of Warwick - Author
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Abstract

Several palladium(ii) and platinum(ii) complexes (1-20) of general formula [M(L )(X)(Y)] [M = Pd, X = Y = Cl (1-Cl-4-Cl), X = Y = OAc (1-OAc-4-OAc); M = Pt: X = Y = Cl (5-8); M = Pd, X = Cl, Y = CH (9-12); M = Pt, X = Cl, Y = CH (13-16) or X = Y = CH (17-20);n= 1-4] have been synthesized by reaction of different Pd(ii) and Pt(ii) derivatives with various 3-substituted 1-(2-pyridyl)-imidazo[1,5-a]pyridines;i.e.L = 1-(2-pyridyl)-3-arylimidazo[1,5-a]pyridine (aryl = Phenyl,L ; 2-o-Tolyl,L ; Mesityl,L ) and 1-(2-pyridyl)-3-benzylimidazo[1,5-a]pyridine (L ). Detailed spectroscopic investigation (including IR, mono- and bi-dimensional H NMR) and elemental analysis has been performed for all these species, allowing their complete characterization.L act asN,N-bidentate ligands and coordinate the metal centers in a chelate fashion through the pyridyl (N ) and the pyridine-like nitrogen atom of the imidazo[1,5-a]pyridine group (N ). The X-ray structural analysis performed on two of Pd(ii) and three Pt(ii) complexes, namely [Pd(L )(CH )Cl] (10), [Pd(L )(CH )Cl] (11) and [Pt(L )Cl ] (5), [Pt(L )Cl ] (8), [Pt(L )(CH )Cl] (14) confirmed the spectroscopic and analytical data. Finally DFT studies unveiled the structural reasons behind the inertia of the synthesised compounds toward metalation, identified as the higher angle steric strain in comparison with the analogous bipyridine complexes. n n 1 2 3 4 1 n 2 3 1 4 2 3 3 3 py im 3 3 2 2 3

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Dalton Transactions due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2021, it was in position 7/46, thus managing to position itself as a Q1 (Primer Cuartil), in the category Chemistry, Inorganic & Nuclear.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2025-12-06:

  • Open Alex: 5
  • Google Scholar: 4
  • WoS: 4

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-12-06:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 14.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 14 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 3.
  • The number of mentions on the social network X (formerly Twitter): 5 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Italy; United Kingdom.