Table 3. Isomorphous Relationships between NxxCl (this work) and NxxBr:^54,84 Comparisons with the Amide-Bridge Reversed Clxx(56) and Brxx(54,83)^a.

NxxCl and NxxBr isomer grids			Clxx and Brxx isomer grids
NxxCl	space group	NxxBr(54)	Clxx(56)	space group	Brxx(54)
NppCl·H2O	Pbca ≠ P21	NppBr	Clpp	P21/c	Brpp
NpmCl	P21/n	NpmBr	Clmp (Z′ = 4)	P1̅ ≠ P1̅	Brmp (Z′ = 2)
NpoCl	Cc	NpoBr	Clop	Pbca	Brop
NmpCl	P21 ≠ C2/c	NmpBr	Clpm	P1̅ ≠ C2/c	Brpm
NmmCl	P21/n ≠ P1̅	NmmBr	Clmm·H2O	P21/c	Brmm·H2O
NmoCl	P21/c –P21/a	NmoBr(84)	Clom	C2/c	Brom
NopCl(85)	P1̅	NopBr	Clpo	C2/c ≠ P1̅	Brpo
NomCl	P1̅ ≠ C2/c	NomBr	Clmo	P1̅ ≠ P21/c	Brmo
NooCl	Pbca	NooBr	Cloo	C2/c	Broo

^aIsomorphous pairs are highlighted in bold with their common space group in italics. The ≠ symbol is for crystal structures that are not isomorphous; for Clmp and Brmp, Z′ is also noted. Clxx and Brxx are understood as ClxxN and BrxxN but are noted this way in refs (56, 54).