Table 2. Salient NxxCl Structural Features (Interplanar Angles, Distances, and Interactions in Å or °)a.
| structure | C6/C5N (°) | C6/amide (°) | C5N/amide (°) | N···N/Oc (Å) | primary H bonds |
|---|---|---|---|---|---|
| NppCl·H2O | 47.68(5) | 7.58(7) | 40.43(5) | 2.831(2)b | hydrate packing (2 × N···O/O···O) |
| 2.838(3)b | |||||
| 2.903(2)b | |||||
| NpmCl | 1.52(9) | 17.96(6) | 18.23(7) | 3.1373(17) | amide···pyridine |
| NpoCl | 83.24(7) | 69.59(8) | 27.43(11) | 2.797(2)c | amide···amide |
| NmpCl | 7.65(14) | 32.11(10) | 32.02(9) | 3.079(3) | amide···pyridine |
| NmmCl | 56.53(4) | 30.44(4) | 27.03(5) | 3.0842(13) | amide···pyridine |
| NmoCl | 16.30(17) | 38.87(17) | 25.54(15) | 2.884(3)c | amide···amide |
| NopCl | 2.86(7) | 1.26(7) | 1.75(7) | 2.6631(16) | intra as (N–H···N) |
| NomCl | 1.07(6) | 7.86(5) | 6.91(5) | 2.6536(13) | intra as (N–H···N) |
| NooCl | 8.6(2) | 9.7(2) | 1.2(2) | 2.624(4) | intra as (N–H···N) |
a
C6 is the (C11, ..., C16) benzene plane, C5N is the (C21, ..., C26) pyridine ring plane, and the amide is represented by the five atom C21–C1(=O1)N1–C11 plane (Scheme 1) and with reference to Figures 1–6.
b
NppCl monohydrate structure with N1···O1W, O1W···O1, and O1W···N1 hydrogen bonding.
c
Represents N···O (amide···amide) with the intramolecular N···N interactions underlined.