Table 2.

Selected geometrical parameters of the investigated complexes of fenamic acids with acridine including inter- and intramolecular hydrogen bonds.

			O1–H1O…N2				N1–H1…O2
Complex	C1-O1 [Å]	C1=O2 [Å]	O1–H1O [Å]	H1O…N2 [Å]	O1…N2 [Å]	OHN [°]	N1–H1 [Å]	H1…O2 [Å]	N1… O2 [Å]	NHO [°]
acridine–fenamic acid [5]	1.3162(18)	1.2336(18)	1.06(2)	1.55(2)	2.609(2)	173(2)	0.886(16)	1.99(2)	2.691(2)	135(2)
Acridine–flufenamic acid (1)	1.3221(14)	1.2292(15)	0.990(18)	1.626(18)	2.6118(14)	173.2(16)	0.872(16)	1.958(15)	2.6714(15)	138.0(14)
Acridine–mefenamic acid (2)	1.3172(15)	1.2317(16)	1.021(19)	1.597(19)	2.6163(16)	175.0(16)	0.876(17)	1.944(16)	2.6660(16)	138.8(14)
Acridine–tolfenamic acid (3)	1.3153(16)	1.2322(16)	0.89(2)	1.72(2)	2.6103(16)	175(2)	0.812(19)	2.011(19)	2.6692(16)	137.8(17)