Describing hydrogen-bonded structures; topology graphs, nodal symbols and connectivity tables, exemplified by five polymorphs of each of sulfathiazole and sulfapyridine

Table 1 Constituents of the HBS symbols for polymorphs of sulfathiazole (Stz) and sulfapyridine (Spn)

HBS	Topology		Node type 1		Node type 2
	D	T	n _m	o ₁ . o ₂ …. o _m	n _m	o ₁ . o ₂ …. o _m
Stz-I	F	(4⁴.5³.6⁷.7)(5².6³.7)	7₆	g.2_1. g.2_1. \( {\overline{1}}^{\mathrm{II}} \) _.+	5₄	2₁.\( {\overline{1}}^{\mathrm{II}} \) _.2_1.+
Stz-II	L	3⁶.4⁶.5³-hxl	8₆	2₁ ^II. − .2₁ ^II. − . − .−	8₆	2₁ ^II. − .2₁ ^II. − . − .−
Stz-III	L	4⁴.6²-sql	6₄	(2₁)^II.(g).(2₁)^II.(t)	6₄	(2₁)^II.(t).(2₁)^II.(g)
Stz-IV	L	4⁴.6²-sql	6₄	2₁ ^II.t.2₁ ^II.t
Stz-V	L	4⁴.6²-sql	6₄	2₁ ^II.g.2₁ ^II.g
Spn-II	F	4⁴.6⁶-sqp ^a	6₅	\( {\overline{1}}^{\mathrm{II}} \).g.g.g.g
Spn-III	L	3³.4³.5⁴-tts	6₅	\( {\overline{1}}^{\mathrm{II}} \).2₁.g.2₁ .g
Spn-IV	L	4⁸.6²-SnS ^a	6₅	\( {\overline{1}}^{\mathrm{II}} \).g.g.g.g
Spn-V	F	(5⁵.6⁴.7)(5⁶.6³.7)^b	6₅	+ ^II.g. − .g.+	6₅	+ ^II.2₁. −.2₁.+
Spn-VI (A)	F	4⁴.6⁶-nov ^c	6₅	g.2₁.g.2₁.\( {\overline{1}}^{\mathrm{II}} \)
Spn-VI (B) ^d	L	6³-hcb	4₃	2₁.\( {\overline{1}}^{\mathrm{II}} \).2₁

ISSN: 2661-801X