Cyanidotris(1,3,5-tri­aza-7-phosphaadamantane)silver(I) tetra­hydrate

Zamisa, S.J.; Adeleke, A.A.; Zinyemba, O.; Omondi, B.

doi:10.1107/S2414314625009253

metal-organic compounds

IUCrDATA

ISSN: 2414-3146

Volume 10| Part 10| October 2025| x250925

https://doi.org/10.1107/S2414314625009253

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Cyanidotris(1,3,5-triaza-7-phosphaadamantane)silver(I) tetrahydrate

Sizwe J. Zamisa,^a ^* Adesola A. Adeleke,^a Orpah Zinyemba ^b and Bernard Omondi ^a

^aSchool of Agriculture and Science, Discipline of Chemistry, University of KwaZulu-Natal, Private Bag X54001, Durban, 4000, South Africa, and ^bDepartment of Chemical Sciences, University of Johannesburg, PO Box 524 Auckland, Park, Johannesburg, 2006, South Africa
^*Correspondence e-mail: [email protected]

Edited by I. Brito, University of Antofagasta, Chile (Received 17 October 2025; accepted 21 October 2025; online 24 October 2025)

The title compound, [Ag(CN)(PTA)₃]·4H₂O, is a water-soluble discrete silver(I) complex where the silver center is coordinated by three phosphorus atoms from distinct 1,3,5-triaza-7-phosphaadamantane (PTA, C₆H₁₂N₃P) ligands and one carbon atom from a cyanide ion, forming a distorted tetrahedral geometry. The asymmetric unit consisting of a [AgCN(PTA)_3/2)] unit and two water molecules. The Ag—P bond distances range from 2.4696 (4) to 2.4728 (6) Å, and the Ag—C bond distance is 2.168 (2) Å, while the bond angles around the silver center vary between 107.402 (13) and 111.07 (3)°, confirming its distorted tetrahedral coordination environment. Intermolecular O—H⋯N and O—H⋯O hydrogen bonds in the crystal packing of the title compound generate a two-dimensional supramolecular architecture with a corrugated sheet-like topology that extends along the crystallographic bc plane.

Keywords: crystal structure; 1,3,5-triaza-7-phosphaadamantane (PTA); silver-PTA complex; cyanide ion.

CCDC reference: 2496890

Structure description

The cage-like, monodentate phosphine ligand 1,3,5-triaza-7-phosphaadamantane (PTA) and its derivatives have attracted significant attention due to their exceptional solubility in aqueous media, attributed to their unique structure featuring a soft phosphorus donor and three hard nitrogen atoms (Krogstad et al., 2007 ). PTA typically coordinates metals via the phosphorus atom in a monodentate fashion (PTA-κP), while its nitrogen atoms offer additional coordination possibilities that influence the structure and function of metal complexes (Darensbourg et al., 1997 ). Silver(I) ions form stable and soluble complexes with PTA, enhancing their suitability for applications in catalysis (Phillips et al., 2004 ), medicinal chemistry (Guerriero & Gonsalvi, 2021 ), and photoluminescence (Sierra-Martin et al., 2018 ). Herein, the synthesis and crystal structure of the discrete monomeric complex [Ag(CN)(PTA)₃]·4H₂O, containing silver(I) coordinated by PTA and cyanide, are reported.

The asymmetric unit of title compound (Fig. 1) comprises a discrete [AgCN(PTA)_3/2] unit and two water molecules, with the full molecule generated by the symmetry operation x, $[{3\over 2}]$ − y, z. It is a neutral discrete complex where the silver(I) center is coordinated by three phosphorus atoms from three distinct PTA ligands and one carbon atom from the nitrile ion, resulting in a distorted tetrahedral geometry around the Ag centre. The bond angles around Ag1 range from 107.402 (13) to 111.07 (3)°, with Ag—P bond distances between 2.4696 (4) and 2.4728 (6) Å and an Ag—C bond distance of 2.168 (2) Å. The crystal structure exhibits an intricate hydrogen-bonding network involving both water molecules and the discrete [Ag(CN)(PTA)₃] units. One water molecule, O1, participates in two distinct hydrogen bonds, in one of which it links adjacent silver complexes through O—H⋯N hydrogen bonds involving nitrogen atoms N2 and N6, forming hydrogen-bonded motifs described by the graph-set notation R₄⁴(16) (Table 1, Fig. 2). In the second, O1 acts as a hydrogen-bond acceptor while O2 functions as a donor, connecting through O—H⋯N hydrogen bonds to N3 of an adjacent [Ag(CN)(PTA)₃] complex. This interaction leads to the formation of a larger hydrogen-bonded ring which can be described by graph-set notation R₆⁶(20) (Fig. 2). Overall, these O—H⋯N and O—H⋯O hydrogen bonds generate a two-dimensional supramolecular architecture with a corrugated sheet-like topology that extends along the crystallographic bc plane as shown in Fig. 3.

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1A⋯N6	0.87	1.97	2.8379 (19)	172
O1—H1B⋯N2ⁱ	0.87	1.98	2.8518 (18)	178
O2—H2C⋯O1ⁱⁱ	0.87	1.93	2.7931 (19)	174
O2—H2D⋯N3ⁱⁱⁱ	0.87	2.01	2.8796 (19)	176
Symmetry codes: (i) ; (ii) $[x-{\script{1\over 2}}, y, -z+{\script{3\over 2}}]$ ; (iii) .

Figure 1
Molecular structure of the title compound with ellipsoids drawn at the 50% probability level.

Figure 2
Representation of the intermolecular O—H⋯O (red dotted lines) and O—H⋯N (blue dotted lines) hydrogen bond in the crystal packing of the title compound.

Figure 3
Representation of the 2-D supramolecular structure of the title compound. The silver and phosphorus atoms are drawn as blue- and purple-colored polyhedra, respectively, while the water molecules are drawn using a space-filling model. The intermolecular O—H⋯O and O—H⋯N hydrogen bonds are shown as red and blue dotted lines, respectively.

Synthesis and crystallization

A methanol solution of PTA (3.84 g, 8.14 mmol) was mixed with aqueous KAg(CN)₂ (3.00 g, 8.14 mmol). The solution volume was reduced by rotary evaporation, then acetonitrile (40 ml) was added to form a cloudy solution. The solvent was reduced using a rotary evaporator to give a white solid, which was isolated by vacuum filtration, washed with 2 × 5 ml of cold ethanol, and dried in vacuo. X-ray quality crystals were obtained by taking an aliquot of cloudy solution after the addition of acetonitrile and leaving it to stand overnight at room temperature.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2.

Table 2
Experimental details

Crystal data
Chemical formula	[Ag(CN)(C₆H₁₂N₃P)₃]·4H₂O
M_r	677.42
Crystal system, space group	Orthorhombic, Pnma
Temperature (K)	173
a, b, c (Å)	11.9813 (4), 20.8423 (7), 12.2359 (4)
V (Å³)	3055.52 (18)
Z	4
Radiation type	Mo Kα
μ (mm⁻¹)	0.86
Crystal size (mm)	0.35 × 0.26 × 0.2

Data collection
Diffractometer	Bruker APEXII CCD
No. of measured, independent and observed [I > 2σ(I)] reflections	62216, 3898, 3438
R_int	0.036
(sin θ/λ)_max (Å⁻¹)	0.667

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.024, 0.058, 1.11
No. of reflections	3898
No. of parameters	184
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.43, −0.39
Computer programs: COSMO and SAINT (Bruker, 2009 ), SHELXS (Sheldrick, 2008 ), SHELXL2018/3 (Sheldrick, 2015 ) and OLEX2 (Dolomanov et al., 2009 ).

Structural data

CCDC reference: 2496890

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2414314625009253/bx4039sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2414314625009253/bx4039Isup2.hkl

checkCIF report

Computing details top

Cyanidotris(1,3,5-triaza-7-phosphaadamantane)silver(I) tetrahydrate top

Crystal data top

[Ag(CN)(C₆H₁₂N₃P)₃]·4H₂O	D_x = 1.473 Mg m⁻³
M_r = 677.42	Mo Kα radiation, λ = 0.71073 Å
Orthorhombic, Pnma	Cell parameters from 9406 reflections
a = 11.9813 (4) Å	θ = 2.4–28.1°
b = 20.8423 (7) Å	µ = 0.86 mm⁻¹
c = 12.2359 (4) Å	T = 173 K
V = 3055.52 (18) Å³	Plate, colourless
Z = 4	0.35 × 0.26 × 0.2 mm
F(000) = 1408

Data collection top

Bruker APEXII CCD diffractometer	R_int = 0.036
Graphite monochromator	θ_max = 28.3°, θ_min = 1.9°
φ and ω scans	h = −15→15
62216 measured reflections	k = −23→27
3898 independent reflections	l = −16→16
3438 reflections with I > 2σ(I)

Refinement top

Refinement on F²	0 restraints
Least-squares matrix: full	Hydrogen site location: mixed
R[F² > 2σ(F²)] = 0.024	H-atom parameters constrained
wR(F²) = 0.058	w = 1/[σ²(F_o²) + (0.0231P)² + 1.851P] where P = (F_o² + 2F_c²)/3
S = 1.11	(Δ/σ)_max = 0.001
3898 reflections	Δρ_max = 0.43 e Å⁻³
184 parameters	Δρ_min = −0.39 e Å⁻³

Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > 2sigma(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Ag1	0.62465 (2)	0.750000	0.41337 (2)	0.02013 (6)
P1	0.55217 (3)	0.84680 (2)	0.32110 (3)	0.02075 (9)
P2	0.55002 (5)	0.750000	0.60179 (5)	0.02143 (13)
N1	0.90084 (18)	0.750000	0.41775 (17)	0.0290 (5)
N2	0.54207 (11)	0.92245 (7)	0.13404 (11)	0.0223 (3)
N3	0.54339 (11)	0.98006 (7)	0.31065 (11)	0.0237 (3)
N4	0.37430 (11)	0.92177 (6)	0.25146 (11)	0.0214 (3)
N5	0.37219 (16)	0.750000	0.74784 (15)	0.0217 (4)
N6	0.54111 (12)	0.80939 (7)	0.80538 (11)	0.0241 (3)
C1	0.80555 (19)	0.750000	0.41643 (17)	0.0189 (4)
C2	0.59015 (14)	0.92665 (8)	0.37527 (14)	0.0246 (4)
H2A	0.563175	0.930191	0.451508	0.030*
H2B	0.672493	0.930543	0.376499	0.030*
C3	0.40053 (13)	0.86158 (8)	0.30910 (13)	0.0214 (3)
H3A	0.365732	0.825328	0.269456	0.026*
H3B	0.367502	0.863133	0.383219	0.026*
C4	0.58916 (14)	0.86184 (8)	0.17668 (13)	0.0234 (3)
H4A	0.671453	0.863213	0.169771	0.028*
H4B	0.561692	0.825747	0.131485	0.028*
C5	0.41875 (14)	0.92161 (8)	0.13962 (13)	0.0224 (3)
H5A	0.389489	0.959593	0.100374	0.027*
H5B	0.391112	0.882910	0.101303	0.027*
C6	0.58279 (14)	0.97793 (8)	0.19676 (14)	0.0258 (4)
H6A	0.558832	1.017712	0.159278	0.031*
H6B	0.665409	0.977234	0.196821	0.031*
C7	0.42017 (14)	0.97741 (8)	0.30966 (14)	0.0242 (3)
H7A	0.393020	0.976580	0.386059	0.029*
H7B	0.391326	1.017034	0.275111	0.029*
C8	0.39835 (19)	0.750000	0.62980 (18)	0.0220 (5)
H8A	0.364394	0.788376	0.595632	0.026*	0.5
H8B	0.364394	0.711624	0.595632	0.026*	0.5
C9	0.58800 (15)	0.68332 (9)	0.69428 (13)	0.0252 (4)
H9A	0.560961	0.642493	0.662501	0.030*
H9B	0.670341	0.680760	0.699484	0.030*
C10	0.41789 (14)	0.80712 (8)	0.80178 (13)	0.0238 (3)
H10A	0.389011	0.808843	0.877528	0.029*
H10B	0.390437	0.845722	0.763055	0.029*
C11	0.5815 (2)	0.750000	0.8573 (2)	0.0272 (5)
H11A	0.557928	0.750000	0.934895	0.033*
H11B	0.664079	0.750001	0.855846	0.033*
O1	0.63144 (11)	0.91639 (6)	0.91827 (10)	0.0299 (3)
H1A	0.599261	0.883175	0.888933	0.045*
H1B	0.602530	0.918979	0.983341	0.045*
O2	0.36431 (11)	0.91126 (6)	0.57555 (11)	0.0344 (3)
H2C	0.292257	0.914947	0.581713	0.052*
H2D	0.390923	0.943306	0.612940	0.052*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Ag1	0.01658 (9)	0.02286 (10)	0.02095 (9)	0.000	0.00045 (7)	0.000
P1	0.0166 (2)	0.0217 (2)	0.0239 (2)	0.00258 (17)	−0.00155 (16)	0.00100 (16)
P2	0.0180 (3)	0.0264 (3)	0.0200 (3)	0.000	0.0037 (2)	0.000
N1	0.0214 (11)	0.0348 (12)	0.0308 (11)	0.000	−0.0006 (9)	0.000
N2	0.0181 (7)	0.0238 (7)	0.0251 (7)	0.0004 (6)	0.0003 (6)	0.0019 (6)
N3	0.0189 (7)	0.0230 (7)	0.0290 (7)	−0.0010 (6)	−0.0025 (6)	−0.0016 (6)
N4	0.0157 (7)	0.0222 (7)	0.0263 (7)	0.0014 (6)	−0.0013 (5)	−0.0010 (5)
N5	0.0169 (10)	0.0270 (10)	0.0213 (9)	0.000	0.0019 (7)	0.000
N6	0.0198 (7)	0.0299 (8)	0.0226 (6)	−0.0020 (6)	0.0016 (5)	−0.0026 (6)
C1	0.0202 (12)	0.0193 (11)	0.0171 (9)	0.000	−0.0007 (8)	0.000
C2	0.0194 (8)	0.0275 (9)	0.0270 (8)	−0.0016 (7)	−0.0054 (7)	−0.0006 (7)
C3	0.0160 (8)	0.0236 (8)	0.0246 (8)	−0.0006 (6)	0.0012 (6)	−0.0008 (6)
C4	0.0168 (8)	0.0266 (9)	0.0268 (8)	0.0035 (7)	0.0019 (6)	0.0000 (7)
C5	0.0183 (8)	0.0249 (8)	0.0239 (8)	0.0010 (7)	−0.0040 (6)	0.0011 (6)
C6	0.0202 (8)	0.0256 (9)	0.0315 (9)	−0.0034 (7)	0.0003 (7)	0.0024 (7)
C7	0.0201 (8)	0.0222 (8)	0.0301 (8)	0.0026 (7)	−0.0010 (7)	−0.0034 (7)
C8	0.0177 (11)	0.0266 (12)	0.0215 (10)	0.000	−0.0004 (9)	0.000
C9	0.0206 (8)	0.0303 (9)	0.0247 (8)	0.0050 (7)	0.0037 (7)	0.0010 (7)
C10	0.0199 (8)	0.0279 (9)	0.0235 (8)	0.0022 (7)	0.0031 (7)	−0.0027 (7)
C11	0.0204 (12)	0.0380 (14)	0.0231 (11)	0.000	−0.0034 (10)	0.000
O1	0.0335 (7)	0.0293 (7)	0.0268 (6)	−0.0078 (6)	0.0049 (5)	0.0000 (5)
O2	0.0333 (7)	0.0291 (7)	0.0407 (8)	0.0006 (6)	0.0008 (6)	−0.0107 (6)

Geometric parameters (Å, º) top

Ag1—P1ⁱ	2.4696 (4)	N6—C11	1.4732 (19)
Ag1—P1	2.4696 (4)	C2—H2A	0.9900
Ag1—P2	2.4728 (6)	C2—H2B	0.9900
Ag1—C1	2.168 (2)	C3—H3A	0.9900
P1—C2	1.8484 (17)	C3—H3B	0.9900
P1—C3	1.8486 (16)	C4—H4A	0.9900
P1—C4	1.8486 (17)	C4—H4B	0.9900
P2—C8	1.849 (2)	C5—H5A	0.9900
P2—C9ⁱ	1.8492 (17)	C5—H5B	0.9900
P2—C9	1.8492 (17)	C6—H6A	0.9900
N1—C1	1.142 (3)	C6—H6B	0.9900
N2—C4	1.479 (2)	C7—H7A	0.9900
N2—C5	1.479 (2)	C7—H7B	0.9900
N2—C6	1.471 (2)	C8—H8A	0.9900
N3—C2	1.476 (2)	C8—H8B	0.9900
N3—C6	1.472 (2)	C9—H9A	0.9900
N3—C7	1.477 (2)	C9—H9B	0.9900
N4—C3	1.473 (2)	C10—H10A	0.9900
N4—C5	1.468 (2)	C10—H10B	0.9900
N4—C7	1.468 (2)	C11—H11A	0.9900
N5—C8	1.478 (3)	C11—H11B	0.9900
N5—C10	1.467 (2)	O1—H1A	0.8700
N5—C10ⁱ	1.467 (2)	O1—H1B	0.8700
N6—C9ⁱ	1.479 (2)	O2—H2C	0.8700
N6—C10	1.478 (2)	O2—H2D	0.8700

P1ⁱ—Ag1—P1	109.55 (2)	N2—C4—P1	113.00 (11)
P1ⁱ—Ag1—P2	107.402 (13)	N2—C4—H4A	109.0
P1—Ag1—P2	107.402 (13)	N2—C4—H4B	109.0
C1—Ag1—P1	111.07 (3)	H4A—C4—H4B	107.8
C1—Ag1—P1ⁱ	111.07 (3)	N2—C5—H5A	108.8
C1—Ag1—P2	110.21 (6)	N2—C5—H5B	108.8
C2—P1—Ag1	119.02 (6)	N4—C5—N2	113.91 (13)
C2—P1—C3	96.91 (8)	N4—C5—H5A	108.8
C2—P1—C4	97.53 (8)	N4—C5—H5B	108.8
C3—P1—Ag1	121.21 (5)	H5A—C5—H5B	107.7
C3—P1—C4	97.55 (7)	N2—C6—N3	114.28 (14)
C4—P1—Ag1	119.42 (6)	N2—C6—H6A	108.7
C8—P2—Ag1	121.88 (8)	N2—C6—H6B	108.7
C8—P2—C9	97.38 (7)	N3—C6—H6A	108.7
C9—P2—Ag1	118.79 (5)	N3—C6—H6B	108.7
C9ⁱ—P2—Ag1	118.79 (5)	H6A—C6—H6B	107.6
C9ⁱ—P2—C8	97.38 (7)	N3—C7—H7A	108.7
C9ⁱ—P2—C9	97.46 (11)	N3—C7—H7B	108.7
C4—N2—C5	110.78 (13)	N4—C7—N3	114.06 (13)
C6—N2—C4	111.15 (13)	N4—C7—H7A	108.7
C6—N2—C5	108.45 (13)	N4—C7—H7B	108.7
C2—N3—C7	110.83 (13)	H7A—C7—H7B	107.6
C6—N3—C2	111.27 (14)	P2—C8—H8A	109.0
C6—N3—C7	108.15 (13)	P2—C8—H8B	109.0
C5—N4—C3	111.53 (12)	N5—C8—P2	112.93 (15)
C7—N4—C3	111.14 (13)	N5—C8—H8A	109.0
C7—N4—C5	108.55 (13)	N5—C8—H8B	109.0
C10ⁱ—N5—C8	111.13 (11)	H8A—C8—H8B	107.8
C10—N5—C8	111.13 (12)	P2—C9—H9A	109.0
C10—N5—C10ⁱ	108.47 (18)	P2—C9—H9B	109.0
C10—N6—C9ⁱ	110.82 (13)	N6ⁱ—C9—P2	113.07 (12)
C11—N6—C9ⁱ	111.00 (15)	N6ⁱ—C9—H9A	109.0
C11—N6—C10	108.29 (15)	N6ⁱ—C9—H9B	109.0
N1—C1—Ag1	179.82 (19)	H9A—C9—H9B	107.8
P1—C2—H2A	108.9	N5—C10—N6	114.35 (14)
P1—C2—H2B	108.9	N5—C10—H10A	108.7
N3—C2—P1	113.18 (11)	N5—C10—H10B	108.7
N3—C2—H2A	108.9	N6—C10—H10A	108.7
N3—C2—H2B	108.9	N6—C10—H10B	108.7
H2A—C2—H2B	107.8	H10A—C10—H10B	107.6
P1—C3—H3A	109.0	N6—C11—N6ⁱ	114.33 (19)
P1—C3—H3B	109.0	N6ⁱ—C11—H11A	108.7
N4—C3—P1	112.93 (11)	N6—C11—H11A	108.7
N4—C3—H3A	109.0	N6—C11—H11B	108.7
N4—C3—H3B	109.0	N6ⁱ—C11—H11B	108.7
H3A—C3—H3B	107.8	H11A—C11—H11B	107.6
P1—C4—H4A	109.0	H1A—O1—H1B	104.5
P1—C4—H4B	109.0	H2C—O2—H2D	104.5

Ag1—P1—C2—N3	178.57 (9)	C6—N2—C4—P1	60.19 (15)
Ag1—P1—C3—N4	179.99 (8)	C6—N2—C5—N4	−55.12 (17)
Ag1—P1—C4—N2	−178.41 (9)	C6—N3—C2—P1	−59.84 (16)
Ag1—P2—C8—N5	180.000 (1)	C6—N3—C7—N4	55.62 (18)
Ag1—P2—C9—N6ⁱ	177.87 (9)	C7—N3—C2—P1	60.54 (16)
C2—P1—C3—N4	49.85 (12)	C7—N3—C6—N2	−55.30 (18)
C2—P1—C4—N2	−48.90 (13)	C7—N4—C3—P1	−61.08 (15)
C2—N3—C6—N2	66.65 (17)	C7—N4—C5—N2	55.58 (17)
C2—N3—C7—N4	−66.60 (18)	C8—P2—C9—N6ⁱ	−49.37 (14)
C3—P1—C2—N3	−49.83 (13)	C8—N5—C10—N6	−67.05 (19)
C3—P1—C4—N2	49.15 (13)	C9ⁱ—P2—C8—N5	−49.27 (6)
C3—N4—C5—N2	−67.19 (17)	C9—P2—C8—N5	49.28 (6)
C3—N4—C7—N3	67.02 (17)	C9ⁱ—P2—C9—N6ⁱ	49.11 (16)
C4—P1—C2—N3	48.78 (13)	C9ⁱ—N6—C10—N5	66.84 (19)
C4—P1—C3—N4	−48.73 (12)	C9ⁱ—N6—C11—N6ⁱ	−66.9 (2)
C4—N2—C5—N4	67.12 (17)	C10—N5—C8—P2	60.44 (12)
C4—N2—C6—N3	−66.84 (17)	C10ⁱ—N5—C8—P2	−60.44 (12)
C5—N2—C4—P1	−60.46 (15)	C10ⁱ—N5—C10—N6	55.4 (2)
C5—N2—C6—N3	55.17 (18)	C10—N6—C11—N6ⁱ	54.9 (2)
C5—N4—C3—P1	60.20 (15)	C11—N6—C10—N5	−55.13 (18)
C5—N4—C7—N3	−55.98 (17)

Symmetry code: (i) x, −y+3/2, z.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1—H1A···N6	0.87	1.97	2.8379 (19)	172
O1—H1B···N2ⁱⁱ	0.87	1.98	2.8518 (18)	178
O2—H2C···O1ⁱⁱⁱ	0.87	1.93	2.7931 (19)	174
O2—H2D···N3^iv	0.87	2.01	2.8796 (19)	176

Symmetry codes: (ii) x, y, z+1; (iii) x−1/2, y, −z+3/2; (iv) −x+1, −y+2, −z+1.

Acknowledgements

We thank the University of KwaZulu-Natal for their support of this research.

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