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Original scientific paper

The Effects of N-Heterocyclic Ligands on the Nature of the Ru–(NO) Bond in Ruthenium Tetraammine Nitrosyl Complexes

Giovanni F. Caramori ; Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany
Gernot Frenking ; Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, D-35032 Marburg, Germany

Fulltext: english, pdf (4 MB) pages 219-232 downloads: 973* cite
APA 6th Edition
Caramori, G.F. & Frenking, G. (2009). The Effects of N-Heterocyclic Ligands on the Nature of the Ru–(NO) Bond in Ruthenium Tetraammine Nitrosyl Complexes. Croatica Chemica Acta, 82 (1), 219-232. Retrieved from https://hrcak.srce.hr/38648
MLA 8th Edition
Caramori, Giovanni F. and Gernot Frenking. "The Effects of N-Heterocyclic Ligands on the Nature of the Ru–(NO) Bond in Ruthenium Tetraammine Nitrosyl Complexes." Croatica Chemica Acta, vol. 82, no. 1, 2009, pp. 219-232. https://hrcak.srce.hr/38648. Accessed 24 Nov. 2020.
Chicago 17th Edition
Caramori, Giovanni F. and Gernot Frenking. "The Effects of N-Heterocyclic Ligands on the Nature of the Ru–(NO) Bond in Ruthenium Tetraammine Nitrosyl Complexes." Croatica Chemica Acta 82, no. 1 (2009): 219-232. https://hrcak.srce.hr/38648
Harvard
Caramori, G.F., and Frenking, G. (2009). 'The Effects of N-Heterocyclic Ligands on the Nature of the Ru–(NO) Bond in Ruthenium Tetraammine Nitrosyl Complexes', Croatica Chemica Acta, 82(1), pp. 219-232. Available at: https://hrcak.srce.hr/38648 (Accessed 24 November 2020)
Vancouver
Caramori GF, Frenking G. The Effects of N-Heterocyclic Ligands on the Nature of the Ru–(NO) Bond in Ruthenium Tetraammine Nitrosyl Complexes. Croatica Chemica Acta [Internet]. 2009 [cited 2020 November 24];82(1):219-232. Available from: https://hrcak.srce.hr/38648
IEEE
G.F. Caramori and G. Frenking, "The Effects of N-Heterocyclic Ligands on the Nature of the Ru–(NO) Bond in Ruthenium Tetraammine Nitrosyl Complexes", Croatica Chemica Acta, vol.82, no. 1, pp. 219-232, 2009. [Online]. Available: https://hrcak.srce.hr/38648. [Accessed: 24 November 2020]

Abstracts
Quantum chemical calculations at the DFT level have been carried out to analyze quantitatively the RuII–(NO)+, RuIII–(NO)0 and RuII–(NO)0 bonds in trans-[RuII(NH3)4(L)(NO)]q and trans-[RuII(NH3)4(L)(NO)]q−1 complexes, where L = 4-picoline (4-pic), C-bound imidazole (imC), N-bound imidazole (imN), nicotinamide (nic), pyridine (py), and pyrazine (pz). Equilibrium geometries and the vibrational frequencies are reported for the ground state GS and light-induced metastable states, MS1 and MS2, presenting good agreement with the experimental data. The nature of the RuII–(NO)+ and RuII–(NO)0 bonds was investigated by means of the energy decomposition analysis, EDA. The Ru–(NO) bonding situation has been analyzed in two different situations: prior and after one-electron reduction at the NO+ group. The EDA results for the complexes prior to the reduction of the NO+ indicate that the metalligand π-orbital interactions between NO+ and the [RuII(NH3)4(L)]q−1 are the most important term and that the trans-ligands imN and nic contribute to an increase in the π-donor strength of the metal centre towards NO+. For RuIII–(NO)0 bonds, the smallest values of ΔEint, ΔEPauli, ΔEelstat, and De are observed when L = imC or L = nic, independent of the state under consideration, GS or MS1, indicating that when L = imC or nic the RuIII–(NO)0 bond in GS or in MS1 states is more labile. After the reduction of the NO+ group, the RuII–(NO)0 becomes more labile when the trans-ligand is imC, which agrees with the experimental rate constants of NO0 dissociation.

Keywords
nitric oxide; ruthenium tetraammines; N-heterocyclic ligands; energy decomposition analysis

Hrčak ID: 38648

URI
https://hrcak.srce.hr/38648

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