Molecular structure, hydrogen bonding, basicity and spectroscopic properties of N,N′-dimethylpiperazine betaines and their hydrohalides

2002 ◽  
Vol 614 (1-3) ◽  
pp. 23-32 ◽  
Author(s):  
Z. Dega-Szafran ◽  
M. Jaskólski ◽  
I. Kurzyca ◽  
P. Barczyński ◽  
M. Szafran
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bonding ◽  
Spectroscopic Properties

Darstellung, Eigenschaften und Kristallstruktur von [Diaqua-1,6-bis(benzimidazol-2-yl)-2,5-dithiahexan-nickel(II)]dibromid-Dihydrat / Synthesis, Properties and Molecular Structure of [Diaqua-1,6-bis(benzimidazol-2-yl)-2,5-dithiahexane-nickel(I I)]dibromide Dihydrate

1990 ◽  
Vol 45 (9) ◽  
pp. 1267-1272 ◽  
Author(s):  
A. Castiñeiras ◽  
W. Hiller ◽  
J. Strähle ◽  
R. Carballo ◽  
M. R. Bermejo ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Mass Spectra ◽  
Spectroscopic Properties ◽  
Water Molecules ◽  
Trans Position ◽  
Triclinic Space Group ◽  
Synthesis Properties ◽  
In Trans

The synthesis, crystal structure and some spectroscopic properties of [Ni(BBDH)(OH2)2]Br2.2 H2O, (BBDH = 1,6-bis(benzimidazol-2-yl)-2,5-dithiahexane), are reported. The compound is obtained from nickel bromide hydrate and BBDH in ethanol. It crystallizes in the triclinic space group P 1̄ with a = 1155.5(3), b = 1203.9(2), c = 1047.0(2) pm, α = 111.62(4), β = 114.25(2), γ = 86.74(3)°, and Z = 2. The structure consists of [Ni(BBDH)(OH2)2]2+ cations joined through hydrogen bonding to two Br- ions and two molecules water of crystallization. BBDH is bound to the Ni2+ ion as quadridentate ligand with two N atoms of the two imidazole moieties in axial positions and the two S atoms in equatorial arrangement. The sixfold coordination is completed by two water molecules in trans-position to the S atoms. Raman, IR and mass spectra are discussed.

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