NDLI: Ag$^{I}$, Cd$^{II}$, and Hg$^{II}$ complexes with 2,5-bis(pyridyl)pyrazine ligands: syntheses, spectral analyses, single crystal, and powder X-ray analyses

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Ag$^{I}$, Cd$^{II}$, and Hg$^{II}$ complexes with 2,5-bis(pyridyl)pyrazine ligands: syntheses, spectral analyses, single crystal, and powder X-ray analyses

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Ag$^{I}$, Cd$^{II}$, and Hg$^{II}$ complexes with 2,5-bis(pyridyl)pyrazine ligands: syntheses, spectral analyses, single crystal, and powder X-ray analyses

Content Provider	Springer Nature Link
Author	Vallat, Olivier Neels, Antonia Stoeckli Evans, Helen
Copyright Year	2003
Abstract	2,5-Bis(4-pyridyl)pyrazine (4-bppz) and 2,5-bis(3-pyridyl)pyrazine (3-bppz) have been synthesized and characterized spectroscopically and crystallographically. 4-bppz [unit cell: a = 7.319(1), b = 5.746(1), c = 12.756(2) Å, β = 93.16(1)° space group: P2$_{1}$/a] was characterized by X-ray single crystal diffraction methods while the structure of 3-bppz [unit cell: a = 10.9148(4), b = 4.5722(1), c = 11.4462(2) Å, β = 109.571(2)° space group: P2$_{1}$/c] was determined from laboratory X-ray powder diffraction data. In these compounds, the pyrazine ring contains two symmetrically attached pyridine substituents with the nitrogen atom in the para positions for 4-bppz and in the meta positions for 3-bppz. Both compounds possess C$_{i}$ symmetry with the pyridine rings twisted by 17.7° (4-bppz) and 2.6° (3-bppz) with respect to the pyrazine ring. 4-bppz was used in the formation of coordination compounds with silver(I) and cadmium(II). The silver(I) complex [Ag(OAc)(4-bppz)]$_{ n }$(1) [unit cell: a = 8.472(1), b = 13.051(1), c = 19.063(2) Å, β = 109.96(1)° space group: P2$_{1}$/c] is characterized by the formation of a perfectly linear chain containing the silver ions bridged by the ligand molecule, the latter using its pyridine nitrogen donor atoms for coordination. A pair of chains is interconnected by silver–silver interactions, the silver coordination sphere being completed by acetate anions. A similar one-dimensional coordination polymer, [Cd(OAc)$_{2}$(4-bppz)(MeOH)]$_{ n }$ (2) [unit cell: a = 8.680(1), b = 10.035(1), c = 13.445(1) Å, α = 77.35(1), β = 71.17(1), γ = 80.14(1)° space group: $$P\bar 1$$ ], was obtained by the reaction of 4-bppz with Cd(OAc)$_{2}$. Ligand 3-bppz forms an analogous cadmium(II) complex, [Cd(OAc)$_{2}$(3-bppz)(MeOH)]$_{ n }$ (3) [unit cell: a = 9.306(1), b = 9.733(1), c = 11.550(1) Å, α = 87.86(1), β = 76.73(1), γ = 85.91(1)° space group: $$P\bar 1$$ ], containing the molecules arranged in double zigzag chains. The reaction of 3-bppz with HgI$_{2}$ leads surprisingly to a binuclear complex, [Hg$_{2}$I$_{4}$(3-bppz)$_{2}$] (4) [unit cell: a = 17.555(1), b = 12.973(1), c = 16.195(1) Å, β = 115.32(1)° space group: C2/c]. Two ligand molecules are bridged by two mercury(II) ions forming a cyclic structure, the tetrahedral coordination sphere of the metal being completed by iodide anions.
Starting Page	39
Ending Page	50
Page Count	12
File Format	PDF
ISSN	10741542
Journal	Journal of Chemical Crystallography
Volume Number	33
Issue Number	1
e-ISSN	15728854
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2003-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Physical Chemistry Crystallography
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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