4,4′-Bipyridin-1-ium bromide monohydrate

Abstract

Key indicatorsSingle-crystal X-ray study T = 90 K Mean '(C±C) = 0.004 A Ê R factor = 0.025 wR factor = 0.052 Data-to-parameter ratio = 16.9For details of how these key indicators were automatically derived from the article, see

Supramolecular aggregation in 4,4′-bipyridin-1,1′-ium dichloride, 4,4′-bipyridin-1,1′-ium dinitrate and 4,4′-bipyridin-1-ium bromide

“…These are different from those reported earlier (Barker et al, 1990; N1---O1 = 2.67 A Ê for two of the O atoms on the nitrate moiety). The hydrogen-bond values in the present study are similar to the N---O in 4,4 H -bipyridin-1-ium bromide monohydrate (Iyere et al, 2002). However, the effect of the hydrogen bonds on the third N---O bond length of the nitrate ion is similar to that observed (Barker et al, 1990).…”

“…We recently reported the synthesis and crystal structure of (III) without a detailed analysis of short contacts (Iyere et al, 2002). In (III), the pyridinium ring is linked to the pyridine ring of another cation by a strong N4ÐH4Á Á ÁN4 H hydrogen bond (Table 3) in a head-to-tail fashion to form a chain along the crystallographic b axis (Fig.…”

Bis(4,4′-bipyridinium) hexacyanoplatinate(IV) bis(4,4′-bipyridine)

“…For the non-protonated N atoms, the CÐNÐC angles range from 115.2 (3) to 117.7 (2) , which is in good agreement with the average C NÐC angle observed in neutral bpy [115.6 (2) ; Boag et al, 1999] and the average value reported in the Cambridge Structural Database (CSD; Version 5.24; Allen, 2002) for neutral bpy molecules (116.5 ; Raj et al, 2003). The protonated C NHÐC angles in (I) are both 120.2 (2) , in agreement with the analogous angle in (Hbpy)BrÁH 2 O of 121.9 (2) (Iyere et al, 2002) and the average value of 121.5 reported for Hbpy + in the CSD (Raj et al, 2003). The internal angles at the C atoms adjacent to N atoms are also affected by protonation of the amide.…”

4,4′-Bipyridinium disaccharinate dihydrate

“…4,4 0 -Bipyridine is protonated on both N atoms, as is evident from the increase in the internal angle [C8-N2-C12 increases from 115.45 (19) in neutral 4,4bipyridine (Boag et al, 1999) to 121.1 (2) in (I)]. Such an increase in the internal angle has also been observed in many 4,4 0 -bipyridinium salts (Iyere et al, 2002). The 4,4 0 -bipyridinium cation lies on an inversion centre (Fig.…”