Substituent Effect on Regium Bonding in Copper(II) Complexes of 4-Substituted Pyridines: Crystallographic and Computational Study
Regium bonding (also called coinage or noble bond) is an attractive weak interaction between the electrophilic region of the regium atom (group 11 element: Rg = Cu, Ag, or Au) and a nucleophilic (Nu) area of the same (intramolecular) or another (intermolecular) molecular entity. The strengths of regium bonding at Rg···Nu depend on the nature of both interacting patterns and electron-donating or -withdrawing character of substituents at Rg and Nu. Experimental and computational studies show that the strengths of Cu···Nu (Nu = Cl or Br) intermolecular regium bonds between the [Cu(Nu)2(4-substituted pyridine)2] tectons can be regulated by the replacement of substituents (−OCH3, −CH3, −H, −Cl, −CONH2, −COOCH3, or −CN) at the para- position of the pyridine ligand. However, due to the involvement of these substituents in various sorts of weak interactions, there is no linear correlation between Hammett’s para-substituent constant (σp) and the Cu···Nu distance of regium bonding.
Authors
- Giuseppe Resnati (ORCID: https://orcid.org/0000-0002-0797-9296)
- Rosa M. Gomila (ORCID: https://orcid.org/0000-0002-0827-8504)
- Atash V. Gurbanov (ORCID: https://orcid.org/0000-0003-1415-8012)
- Vusala A. Aliyeva (ORCID: https://orcid.org/0000-0002-5506-5341)
- Antonio Frontera (ORCID: https://orcid.org/0000-0001-7840-2139)
- Vânia André (ORCID: https://orcid.org/0000-0001-5599-8355)
- Kamran T. Mahmudov⧫ (ORCID: https://orcid.org/0000-0003-0743-6520)
- Luísa M. D. R. S. Martins (ORCID: https://orcid.org/0000-0002-5403-9352)
Institutions
- University of Lisbon (PT)
- Baku State University (AZ)
- Universidade Politécnica de Lisboa (PT)
- Western Caspian University (AZ)
- Baku Engineering University (AZ)
- Universitat de les Illes Balears (ES)
- Politecnico di Milano (IT)
Publication Details
- Journal
- Crystal Growth & Design
- Published
- 2024-10-03
- DOI
- https://doi.org/10.1021/acs.cgd.4c01124
- Citations
- 3
- Primary Topic
- Metal complexes synthesis and properties
- Type
- article
- Field-Weighted Citation Impact
- 0.85
Funders
- Alexander von Humboldt-Stiftung
- Ministerio de Ciencia, Innovación y Universidades
- Baki Dövlət Universiteti
- Centro de Química Estrutural
- Fundação para a Ciência e a Tecnologia
- Instituto Superior Técnico