Infrared spectra of silver-ammine complexes

Geddes, A. L.; Bottger, G. L.

doi:10.1021/ic50074a020

Cited by 33 publications

(20 citation statements)

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“…The assignments for the NH 3 bands in [Ag(NH 3 ) 2 ] + [Ag 3 (N 5 ) 4 ]ˉ are unequivocal, including the different N-H stretching vibrations in the region of 3000–3400 cm −1 , the symmetric deformation around 1601 cm −1 , and the rocking mode around 688 cm −1 . These absorptions of [Ag(NH 3 ) 2 ] + in [Ag(NH 3 ) 2 ] + [Ag 3 (N 5 ) 4 ]ˉ agree with those of other diamine silver complexes, such as [Ag(NH 3 ) 2 ]NO 3 and [Ag(NH 3 ) 2 ] 2 SO 4 25,26 . In the infrared spectrum of the AgN 5 complex one additional unassigned band is observed at 1704 cm −1 .…”

Section: Resultssupporting

confidence: 76%

Synthesis of AgN5 and its extended 3D energetic framework

et al. 2018

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The pentazolate anion, as a polynitrogen species, holds great promise as a high-energy density material for explosive or propulsion applications. Designing pentazole complexes that contain minimal non-energetic components is desirable in order to increase the material’s energy density. Here, we report a solvent-free pentazolate complex, AgN5, and a 3D energetic-framework, [Ag(NH3)2]+[Ag3(N5)4]ˉ, constructed from silver and cyclo-N5ˉ. The complexes are stable up to 90 °C and only Ag and N2 are observed as the final decomposition products. Efforts to isolate pure AgN5 were unsuccessful due to partial photolytical and/or thermal-decomposition to AgN3. Convincing evidence for the formation of AgN5 as the original reaction product is presented. The isolation of a cyclo-N5ˉ complex, devoid of stabilizing molecules and ions, such as H2O, H3O+, and NH4+, constitutes a major advance in pentazole chemistry.

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Section: Resultssupporting

confidence: 76%

Synthesis of AgN5 and its extended 3D energetic framework

et al. 2018

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“…The presence of AgClO 4 is confirmed by the appearance of a unique perchlorate stretching band at 1122 cm −1 , distinctive of an anion in tetrahedral symmetry and purely ionic character [35], as previously observed for B [14]. It is also possible to detect a weak band at 479 cm −1 tentatively ascribable to the Ag-N bond stretching [36], confirming the coordination of silver(I) by the nitrogen atoms of the pyridyl rings. Another proof can be found in the ESI-MS spectrum of Fe 4 Ag in THF/CH 3 CN with the peak at m/z = 2014.7 for the [Fe 4 Ag(THF)] + ion, in addition to the peaks at m/z = 1836.4 and 1874.8, as previously observed for Fe 4 ( Figure S6 in Supplementary Materials).…”

Section: Assembly Of Fe 4 Agsupporting

confidence: 73%

New Silver(I) Coordination Polymer with Fe4 Single-Molecule Magnets as Long Spacer

et al. 2018

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In continuation of our work on supramolecular architectures of single-molecule magnets (SMMs) as a promising strategy in developing their magnetic performance, in this paper we report the synthesis and single crystal X-ray structure of the centered triangular tetrairon(III) SMM, [Fe4(PhpPy)2(dpm)6], Fe4 (Hdpm = dipivaloylmethane, H3PhpPy = 2-(hydroxymethyl)-2-(4-(pyridine-4-yl)phenyl)propane-1,3-diol), and its assembly in the coordination polymer {[Fe4(PhpPy)2(dpm)6Ag](ClO4)}n, Fe4Ag, upon reaction with silver(I) perchlorate. Thanks to the presence of the pyridyl rings on the two tripodal ligands, Fe4 behaves as divergent ditopic linker, and due to the Fe4:AgClO4 1:1 ratio, Fe4Ag probably possesses a linear arrangement in which silver(I) ions are linearly coordinated by two nitrogen atoms, forming 1D chains whose positive charge is balanced by the perchlorate anions. The stabilization of such a polymeric structure can be ascribed to the long distance between the two donor nitrogen atoms (23.4 Å) and their donor power. Fe4Ag shows slow relaxation of the magnetization which follows a thermally activated process with Ueff/kB = 11.17(18) K, τ0 = 2.24(17) 10−7 s in zero field, and Ueff/kB = 14.49(5) K, τ0 = 3.88(8) 10−7 s in 1-kOe applied field, in line with what reported for tetrairon(III) SMMs acting as building blocks in polymeric structures.

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“…Infrared spectra of metal ammine complexes have been investigated by several groups with a major focus on the compounds [Ag(NH 3 ) 2 ] 2 SO 4 and [Ag(NH 3 ) 2 ]NO 3 . The corresponding Raman spectra were published by the groups of Tobias 5 and Geddes 6. Proton and deuterium magnetic resonance studies of [Ag(NH 3 ) 2 ]Ag(NO 2 ) 2 and [Ag(ND 3 ) 2 ]Ag(NO 2 ) 2 were reported in the literature 7.…”

Section: Introductionmentioning

confidence: 99%