Synthesis and characterization of silver(I) pyrazolylmethylpyridine complexes and their implementation as metallic silver thin film precursors

Irene Bassanetti, Christina P. Twist, Myung Gil Kim, Afif M. Seyam, Hassan S. Bazzi, Q. Jane Wang, Yip Wah Chung, Luciano Marchió, Massimiliano Delferro, Tobin J Marks

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Abstract

A series of light- and air-stable silver(I) pyrazolylmethylpyridine complexes [Ag(LR)]n(BF4)n (L = pyrazolylmethylpyridine; R = H, 1; R = Me, 2; R = i-Pr, 3) and [Ag(L R)(NO3)]2 (L = pyrazolylmethylpyridine; R = H, 4; R = Me, 5; R = i-Pr, 6) has been synthesized and structurally and spectroscopically characterized. In all of the molecular structures, the pyrazolylmethylpyridine ligands bridge two metal centers, thus giving rise to dinuclear (2, 4, 5, and 6) or polynuclear structures (1 and 3). The role played by the counteranions is also of relevance, because dimeric structures are invariably obtained with NO3- (4, 5, and 6), whereas the less-coordinating BF4- counteranion affords polymeric structures (1 and 3). Also, through atoms-in-molecules (AIM) analysis of the electron density, an argentophilic Ag···Ag interaction is found in complexes 2 and 4. Thermogravimetric analysis (TGA) shows that the thermolytic properties of the present complexes can be significantly modified by altering the ligand structure and counteranion. These complexes were further investigated as thin silver film precursors by spin-coating solutions, followed by annealing at 310°C on 52100 steel substrates. The resulting polycrystalline cubic-phase Ag films of ∼55 nm thickness exhibit low levels of extraneous element contamination by X-ray photoelectron spectroscopy (XPS). Atomic force microscopy (AFM) and scanning electron microscopy (SEM) indicate that film growth proceeds primarily via an island growth (Volmer-Weber) mechanism. Complex 4 was also evaluated as a lubricant additive in ball-on-disk tribological tests. The results of the friction evaluation and wear measurements indicate a significant reduction in wear (∼ 88%) at optimized Ag complex concentrations with little change in friction. The enhanced wear performance is attributed to facile shearing of Ag metal in the contact region, resulting from thermolysis of the silver complexes, and is confirmed by energy-dispersive X-ray analysis of the resulting wear scars.

Original languageEnglish
Pages (from-to)4629-4638
Number of pages10
JournalInorganic Chemistry
Volume53
Issue number9
DOIs
Publication statusPublished - May 5 2014

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Silver
Friction
silver
Wear of materials
Thin films
synthesis
thin films
Metals
Ligands
Lubricants
Photoelectron Spectroscopy
friction
Atomic Force Microscopy
Steel
Growth
Molecular Structure
Islands
Electron Scanning Microscopy
Thermolysis
scars

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Medicine(all)

Cite this

Synthesis and characterization of silver(I) pyrazolylmethylpyridine complexes and their implementation as metallic silver thin film precursors. / Bassanetti, Irene; Twist, Christina P.; Kim, Myung Gil; Seyam, Afif M.; Bazzi, Hassan S.; Wang, Q. Jane; Chung, Yip Wah; Marchió, Luciano; Delferro, Massimiliano; Marks, Tobin J.

In: Inorganic Chemistry, Vol. 53, No. 9, 05.05.2014, p. 4629-4638.

Research output: Contribution to journalArticle

Bassanetti, I, Twist, CP, Kim, MG, Seyam, AM, Bazzi, HS, Wang, QJ, Chung, YW, Marchió, L, Delferro, M & Marks, TJ 2014, 'Synthesis and characterization of silver(I) pyrazolylmethylpyridine complexes and their implementation as metallic silver thin film precursors', Inorganic Chemistry, vol. 53, no. 9, pp. 4629-4638. https://doi.org/10.1021/ic500321w
Bassanetti, Irene ; Twist, Christina P. ; Kim, Myung Gil ; Seyam, Afif M. ; Bazzi, Hassan S. ; Wang, Q. Jane ; Chung, Yip Wah ; Marchió, Luciano ; Delferro, Massimiliano ; Marks, Tobin J. / Synthesis and characterization of silver(I) pyrazolylmethylpyridine complexes and their implementation as metallic silver thin film precursors. In: Inorganic Chemistry. 2014 ; Vol. 53, No. 9. pp. 4629-4638.
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AU - Twist, Christina P.

AU - Kim, Myung Gil

AU - Seyam, Afif M.

AU - Bazzi, Hassan S.

AU - Wang, Q. Jane

AU - Chung, Yip Wah

AU - Marchió, Luciano

AU - Delferro, Massimiliano

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N2 - A series of light- and air-stable silver(I) pyrazolylmethylpyridine complexes [Ag(LR)]n(BF4)n (L = pyrazolylmethylpyridine; R = H, 1; R = Me, 2; R = i-Pr, 3) and [Ag(L R)(NO3)]2 (L = pyrazolylmethylpyridine; R = H, 4; R = Me, 5; R = i-Pr, 6) has been synthesized and structurally and spectroscopically characterized. In all of the molecular structures, the pyrazolylmethylpyridine ligands bridge two metal centers, thus giving rise to dinuclear (2, 4, 5, and 6) or polynuclear structures (1 and 3). The role played by the counteranions is also of relevance, because dimeric structures are invariably obtained with NO3- (4, 5, and 6), whereas the less-coordinating BF4- counteranion affords polymeric structures (1 and 3). Also, through atoms-in-molecules (AIM) analysis of the electron density, an argentophilic Ag···Ag interaction is found in complexes 2 and 4. Thermogravimetric analysis (TGA) shows that the thermolytic properties of the present complexes can be significantly modified by altering the ligand structure and counteranion. These complexes were further investigated as thin silver film precursors by spin-coating solutions, followed by annealing at 310°C on 52100 steel substrates. The resulting polycrystalline cubic-phase Ag films of ∼55 nm thickness exhibit low levels of extraneous element contamination by X-ray photoelectron spectroscopy (XPS). Atomic force microscopy (AFM) and scanning electron microscopy (SEM) indicate that film growth proceeds primarily via an island growth (Volmer-Weber) mechanism. Complex 4 was also evaluated as a lubricant additive in ball-on-disk tribological tests. The results of the friction evaluation and wear measurements indicate a significant reduction in wear (∼ 88%) at optimized Ag complex concentrations with little change in friction. The enhanced wear performance is attributed to facile shearing of Ag metal in the contact region, resulting from thermolysis of the silver complexes, and is confirmed by energy-dispersive X-ray analysis of the resulting wear scars.

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