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Table 5 Comparisons of dihedral angles (between carboxylic acid and pyridine) and C-N-C bond angles (involved in acid–base interaction) in compounds 1a-14b

From: Design of co-crystals/salts of some Nitrogenous bases and some derivatives of thiophene carboxylic acids through a combination of hydrogen and halogen bonds

Compound Acid Base Synthon Dihedral angle between carboxylic acid and pyridine Dihedral angle between two pyridine rings Acid–base interaction involved C-N-C bond angle
1. 5TPC AMPY HT 14.2(15), 9.4(5)   116.89
117.69
2. TPC AMPY LHT 19.1(4)   118.80
117.30
3. TDC AMPY HT 1.8(13), 2.4(12)   117.76
117.76
117.92
118.45
4. 5TPC 2NPY HD 8.5(3)   122.01
123.94
121.43
119.49
5. 5TPC CYT HD 57.0(2)   103.18
6. 5TPC BA HD 13(3)   117.84
7. 5TPC ACR HD 63.6(8)   120.06
8. 5TPC 44BIPY HD 29.68(10) 0.00(7) 117.23
9. TPC 44BIPY HD 15.6(3) 35.13(12) 117.58
10. 5TPC 44TMBP HD 7.5(16) 78.31(14) 116.38
11. TPC 44TMBP HT 2.9(4), 7.9(4) 51.7(4) 117.25
117.85
12. TDC 44TMBP HD 69.16(1) 82.15 121.82
13. 5TPC 44BIPZ HD 59.06(3) 0.00(1) 111.32
14. 5TPC 44PYNO HD 5.34(3) 0.00(1) 119.93