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Infrared spectra of silver complexes with 2-aminopyridine and crystal structure of the 4:3 aminopyridine-silver nitrate compound

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Abstract

The 4∶3 complex formed between 2-aminopyridine (ampy) and AgNO3 belongs to the orthorhombic space groupPccn. The unit cell of dimensionsa=7.992(4),b=16.788(5),c=21.034(8) Å contains four formula units. The structure was refined on 998 nonzero reflections toR=0.038. The crystal contains the dimeric [Ag3(ampy)4]3+ cation. Two of the three independent Ag atoms are each coordinated to two ampy ligandsvia the heterocyclic nitrogen lone pair (mean Ag-N=2.18 Å), and the N-Ag-N angle in this [ampy-Ag-ampy]+ unit is 154.0°. By using the two available amino groups, the [ampy-Ag-ampy]+ unit acts as a bidentate “ligand,” and two such units related by a twofold axis achieve a roughly tetrahedral environment of NH2 lone pairs about the third Ag atom (mean Ag-N=2.39 Å). The infrared spectra of [Ag3(ampy)4](NO3)3, [Ag(ampy)2]ClO4, [Ag3(ampy-H)2]NO3, and [Ag3(ampy-H)2]ClO4, and those of their amino-deuterated derivatives, are discussed. Diagnostic regions are proposed to identify coordinationvia the amino group and the heterocyclic nitrogen atom.

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  1. Département de Chimie, Université de Montréal, C.P. 6210, Succ. A, H3C 3V1, Montréal, Québec, Canada

    Jean-Pierre Charland & André L. Beauchamp

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  1. Jean-Pierre Charland
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  2. André L. Beauchamp
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Charland, JP., Beauchamp, A.L. Infrared spectra of silver complexes with 2-aminopyridine and crystal structure of the 4:3 aminopyridine-silver nitrate compound. Journal of Crystallographic and Spectroscopic Research 15, 581–601 (1985). https://doi.org/10.1007/BF01164773

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