Synthesis and crystal structure of [Sr(urea)(NO3)2]n

Bektursinova, A.; Djumanazarova, Z.; Uzakbergenova, Z.; Ashurov, J.; Khan, A.A.; Kadirova, S.; Torambetov, B.

doi:10.1107/S2056989024012386

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Volume 81| Part 2| February 2025|

https://doi.org/10.1107/S2056989024012386

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Synthesis and crystal structure of [Sr(urea)(NO₃)₂]_n

Aysanem Bektursinova,^a Zulfiya Djumanazarova,^a Zamira Uzakbergenova,^a Jamshid Ashurov,^b Akram A Khan,^c Shakhnoza Kadirova ^d and Batirbay Torambetov ^d,^c ^*

^aKarakalpak State University, 1 Ch. Abdirov St Nukus, 230112, Uzbekistan, ^bInstitute of Bioorganic Chemistry, Academy of Sciences of Uzbekistan, M. Ulugbek St, 83, Tashkent, 100125, Uzbekistan, ^cPhysical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune-411008, India, and ^dNational University of Uzbekistan named after Mirzo Ulugbek, 4 University St, Tashkent, 100174, Uzbekistan
^*Correspondence e-mail: torambetov_b@mail.ru

Edited by B. Therrien, University of Neuchâtel, Switzerland (Received 16 December 2024; accepted 23 December 2024; online 7 January 2025)

The crystal structure of poly[di-μ₂-nitrato-μ₂-urea-strontium(II)], [Sr(NO₃)₂(CH₄N₂O)]_n, was determined using single-crystal X-ray diffraction. Crystallizing in the orthorhombic space group Aba2, the asymmetric unit consists of an Sr^II cation, two nitrate anions, and two half urea molecules. The Sr^II cation adopts a distorted decahedral geometry coordinated by ten oxygen atoms, with Sr—O bond lengths ranging from 2.573 (3) to 2.847 (5) Å. The nitrate anions act as bidentate ligands, displaying both terminal and bridging coordination modes. The structure features a robust coordination network supported by hydrogen bonding. These results provide insight into the coordination behaviour of Sr^II with nitrate and urea ligands, contributing to the understanding of supramolecular architectures in metal–organic frameworks (MOFs).

Keywords: crystal structure; strontium; caramid; urea; Hirshfeld surface analysis.

CCDC reference: 2297418

1. Chemical context

The study of coordination polymers (CPs) and the crystal engineering of MOFs has garnered significant interest due to their diverse structural architectures and potential applications in catalysis, gas storage, and sensing (Allendorf & Stavila, 2015 ). Metal ions such as Sr^II have proven versatile in forming coordination complexes owing to their ability to adopt various coordination geometries (Kainat et al., 2024 ). Ligands like urea and nitrate, capable of acting as terminal and bridging ligands, offer unique opportunities for the construction of supramolecular networks (Reek et al., 2022 ). In this study, the polymeric complex [Sr(urea)(NO₃)₂]_n was synthesized and characterized.

2. Structural commentary

The crystal structure of the title compound [Sr(urea)(NO₃)₂]_n was determined in the orthorhombic space group Aba2. The asymmetric unit consists of an Sr^II cation, two nitrate anions, and one urea molecule. The Sr^II cation is coordinated by ten oxygen atoms, eight of which originate from nitrate anions and two from urea molecules, adopting a decahedral geometry (Fig. 1). The Sr^II cation forms a distorted decahedral coordination environment through interactions with oxygen atoms from the urea and nitrate ligands. The nitrate anions exhibit dual binding modes, participating in bidentate bridging interactions, which stabilize the structure through hydrogen bonds and intermolecular forces. Such versatility in coordination and binding contributes to the robust di-periodic layered network observed in the crystal structure. These findings provide insights into the design of Sr^II-based CPs and MOFs, highlighting the significance of urea and nitrate ligands in generating diverse structural motifs and functional materials (Preethi et al., 2024 ).

Figure 1
(a) The asymmetric unit of [Sr(urea)(NO₃)₂]_n with the atom-labelling scheme and displacement ellipsoids drawn at the 30% probability level. (b) Extended coordination sphere of the polymeric complex.

3. Supramolecular features

In the crystal, closely associated molecules form a di-periodic sheet structure along the a- and b-axis directions. Along the c axis, molecules are connected by hydrogen bonds (N4—H4A⋯O3ⁱⁱ, N4—H4B⋯O5^vi, N4—H4B⋯O6^vi, N2—H2A⋯O6ⁱ, N2—H2B⋯O1^vii, N2—H2B⋯O3^vii; Table 1). The Sr—O (Sr-nitrate) bond lengths range from 2.622 (3) Å to 2.847 (5) Å, while the Sr–O (Sr-urea) bond lengths fall between 2.573 (3) Å and 2.604 (3) Å, reflecting variations due to ligand-field effects and steric factors (Fig. 1). The nitrate anions act as bidentate ligand, contributing to the coordination geometry in two distinct modes. First, two oxygen atoms from each nitrate molecule coordinate to the same Sr^II ion. Second, the oxygen atoms O7 and O8 are bidentate bridging ligands, connecting two Sr^II cations and forming a distorted parallelogram. The bond angles of the bridging oxygen atoms are 108.0 (2)° for (Sr—O7—Sr) and 106.13 (19)° for (Sr—O8—Sr). In the crystal structure, the urea molecules are located on a special position with a twofold rotation axis at (−x, −y, z), oriented along the [001] direction. This structural arrangement results in a stable coordination network supported by interactions between the Sr^II cations, nitrate anions, and urea (Fig. 2).

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N4—H4A⋯O3ⁱ	0.86	2.44	2.956 (6)	119
N4—H4B⋯O5ⁱⁱ	0.86	2.29	3.086 (6)	154
N4—H4B⋯O6ⁱⁱ	0.86	2.59	3.304 (7)	141
N2—H2A⋯O6ⁱⁱⁱ	0.86	2.50	3.020 (6)	120
N2—H2B⋯O1^iv	0.86	2.33	3.139 (7)	157
N2—H2B⋯O3^iv	0.86	2.57	3.312 (6)	145
Symmetry codes: (i) $[-x+{\script{3\over 2}}, y-{\script{1\over 2}}, z]$ ; (ii) $[-x+1, -y+{\script{1\over 2}}, z-{\script{1\over 2}}]$ ; (iii) $[x+{\script{1\over 2}}, -y+{\script{1\over 2}}, z]$ ; (iv) $[-x+{\script{3\over 2}}, y, z+{\script{1\over 2}}]$ .

Figure 2
Hydrogen-bonded chains (blue dashed lines) in the crystal of [Sr(urea)(NO₃)₂]_n.

4. Database survey

A survey of the Cambridge Structural Database (CSD, Version 5.45, last updated March 2024; Groom et al., 2016 ) revealed around 320 metal complexes where urea is directly bonded to a metal via oxygen, whereas only one structure where Sr is directly bonded to the oxygen atom of the urea molecule has been reported (MOXJUG; Schwarz & Streb, 2015 ). Moreover, no crystal structure similar to that of [Sr(urea)(NO₃)₂]_n has been reported.

5. Synthesis and crystallization

Strontium nitrate (Sr(NO₃)₂, 0.212 g, 1 mmol) and carbamide (urea, 0.12 g, 2 mmol) were each individually dissolved in 5 mL of a 1:1 volumetric mixture of water and ethanol, ensuring complete dissolution of both compounds. The solutions were mixed together and kept for 10 min in an ultrasonic bath. The obtained colourless solution was filtered and left for crystallization. Single crystals of the title complex suitable for X-ray analysis were obtained by slow evaporation of the solution over a period of 10 days.

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2. All hydrogen atoms were located in difference-Fourier maps and reﬁned using an isotropic approximation.

Table 2
Experimental details

Crystal data
Chemical formula	[Sr(NO₃)₂(CH₄N₂O)]
M_r	271.70
Crystal system, space group	Orthorhombic, Aba2
Temperature (K)	293
a, b, c (Å)	9.3527 (1), 9.9701 (1), 17.0496 (2)
V (Å³)	1589.83 (3)
Z	8
Radiation type	Cu Kα
μ (mm⁻¹)	9.77
Crystal size (mm)	0.12 × 0.08 × 0.06

Data collection
Diffractometer	XtaLAB Synergy, Single source at home/near, HyPix3000
Absorption correction	Multi-scan (CrysAlis PRO; Rigaku OD, 2022 $[Rigaku OD (2022). CrysAlis PRO. Rigaku Oxford Diffraction Ltd, Yarnton, Oxfordshire, England.]$ )
T_min, T_max	0.300, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	6435, 1517, 1487
R_int	0.029
(sin θ/λ)_max (Å⁻¹)	0.614

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.021, 0.055, 1.07
No. of reflections	1517
No. of parameters	121
No. of restraints	1
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.74, −0.27
Absolute structure	Flack x)' determined using 678 quotients [(I⁺)−(I⁻)]/[(I⁺)+(I⁻)] (Parsons et al., 2013 )
Absolute structure parameter	−0.020 (15)
Computer programs: CrysAlis PRO (Rigaku OD, 2022 $[Rigaku OD (2022). CrysAlis PRO. Rigaku Oxford Diffraction Ltd, Yarnton, Oxfordshire, England.]$ ), SHELXT2018/2 (Sheldrick, 2015a ), SHELXL2016/6 (Sheldrick, 2015b ) and OLEX2 (Dolomanov et al., 2009 ).

Supporting information

CCDC reference: 2297418

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2056989024012386/tx2092sup1.cif

checkCIF report

Computing details top

Ooly[di-µ₂-nitrato-µ₂-urea-strontium(II)] top

Crystal data top

[Sr(NO₃)₂(CH₄N₂O)]	D_x = 2.270 Mg m⁻³
M_r = 271.70	Cu Kα radiation, λ = 1.54184 Å
Orthorhombic, Aba2	Cell parameters from 5341 reflections
a = 9.3527 (1) Å	θ = 4.7–71.3°
b = 9.9701 (1) Å	µ = 9.77 mm⁻¹
c = 17.0496 (2) Å	T = 293 K
V = 1589.83 (3) Å³	Block, colourless
Z = 8	0.12 × 0.08 × 0.06 mm
F(000) = 1056

Data collection top

XtaLAB Synergy, Single source at home/near, HyPix3000 diffractometer	1517 independent reflections
Radiation source: micro-focus sealed X-ray tube, PhotonJet (Cu) X-ray Source	1487 reflections with I > 2σ(I)
Mirror monochromator	R_int = 0.029
Detector resolution: 10.0000 pixels mm^-1	θ_max = 71.2°, θ_min = 5.2°
ω scans	h = −11→10
Absorption correction: multi-scan (CrysAlisPro; Rigaku OD, 2022)	k = −11→12
T_min = 0.300, T_max = 1.000	l = −20→20
6435 measured reflections

Refinement top

Refinement on F²	H-atom parameters constrained
Least-squares matrix: full	w = 1/[σ²(F_o²) + (0.0374P)² + 0.1494P] where P = (F_o² + 2F_c²)/3
R[F² > 2σ(F²)] = 0.021	(Δ/σ)_max = 0.001
wR(F²) = 0.055	Δρ_max = 0.74 e Å⁻³
S = 1.07	Δρ_min = −0.27 e Å⁻³
1517 reflections	Extinction correction: SHELXL2016/6 (Sheldrick, 2015b), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
121 parameters	Extinction coefficient: 0.00038 (6)
1 restraint	Absolute structure: Flack x)' determined using 678 quotients [(I⁺)-(I^-)]/[(I⁺)+(I^-)] (Parsons et al., 2013)
Hydrogen site location: inferred from neighbouring sites	Absolute structure parameter: −0.020 (15)

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.

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

	x	y	z	U_iso*/U_eq
Sr1	0.66197 (3)	0.35686 (3)	0.50071 (5)	0.02435 (15)
O5	0.5691 (4)	0.2029 (4)	0.6237 (2)	0.0380 (8)
O7	0.500000	0.500000	0.5894 (3)	0.0317 (12)
O4	0.4300 (3)	0.2135 (4)	0.52232 (18)	0.0361 (8)
O8	0.500000	0.500000	0.4089 (3)	0.0328 (12)
O1	0.8252 (4)	0.4683 (4)	0.3800 (2)	0.0396 (9)
O2	0.7896 (4)	0.5891 (3)	0.48352 (18)	0.0367 (8)
O6	0.3592 (4)	0.1112 (5)	0.6265 (3)	0.0508 (10)
O3	0.8632 (4)	0.6835 (4)	0.3775 (2)	0.0463 (9)
C1	0.500000	0.500000	0.6641 (5)	0.042 (2)
N3	0.4530 (4)	0.1754 (4)	0.5924 (2)	0.0314 (8)
N4	0.4670 (6)	0.3903 (6)	0.2952 (3)	0.0610 (14)
H4A	0.445171	0.317865	0.319881	0.073*
H4B	0.467264	0.391253	0.244752	0.073*
N2	0.6152 (6)	0.5375 (8)	0.7034 (3)	0.0719 (18)
H2A	0.690719	0.562025	0.678455	0.086*
H2B	0.614571	0.537260	0.753809	0.086*
N1	0.8270 (4)	0.5799 (4)	0.4124 (3)	0.0312 (9)
C2	0.500000	0.500000	0.3348 (5)	0.038 (2)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Sr1	0.0243 (2)	0.0232 (2)	0.0255 (2)	0.00128 (10)	0.0001 (2)	0.00073 (18)
O5	0.0368 (19)	0.0425 (19)	0.0346 (18)	−0.0014 (15)	−0.0072 (14)	0.0028 (15)
O7	0.037 (3)	0.036 (3)	0.022 (3)	0.006 (2)	0.000	0.000
O4	0.0326 (15)	0.0439 (18)	0.032 (2)	−0.0061 (14)	−0.0059 (11)	0.0078 (13)
O8	0.037 (3)	0.043 (3)	0.019 (3)	0.011 (2)	0.000	0.000
O1	0.049 (2)	0.031 (2)	0.038 (2)	−0.0005 (14)	0.0039 (14)	−0.0070 (15)
O2	0.0462 (16)	0.0334 (16)	0.030 (2)	−0.0066 (13)	0.0083 (14)	−0.0046 (12)
O6	0.051 (2)	0.059 (2)	0.043 (2)	−0.0199 (18)	0.0080 (18)	0.010 (2)
O3	0.065 (2)	0.037 (2)	0.036 (2)	−0.0119 (19)	0.0026 (19)	0.0080 (17)
C1	0.054 (5)	0.042 (5)	0.029 (5)	0.028 (4)	0.000	0.000
N3	0.029 (2)	0.0276 (18)	0.037 (2)	0.0002 (15)	0.0008 (16)	−0.0026 (16)
N4	0.084 (4)	0.072 (3)	0.028 (2)	0.021 (3)	−0.013 (3)	−0.016 (2)
N2	0.070 (4)	0.110 (5)	0.036 (3)	0.030 (4)	−0.021 (3)	−0.024 (3)
N1	0.0311 (19)	0.029 (2)	0.034 (2)	0.0006 (14)	−0.0019 (14)	−0.0016 (17)
C2	0.034 (4)	0.056 (6)	0.025 (5)	0.015 (4)	0.000	0.000

Geometric parameters (Å, º) top

Sr1—O5	2.740 (4)	O4—N3	1.272 (5)
Sr1—O7	2.573 (3)	O8—C2	1.264 (10)
Sr1—O4	2.624 (3)	O1—N1	1.243 (6)
Sr1—O4ⁱ	2.629 (3)	O2—N1	1.265 (5)
Sr1—O8	2.604 (3)	O6—N3	1.232 (5)
Sr1—O1	2.793 (4)	O3—N1	1.239 (6)
Sr1—O2ⁱⁱ	2.723 (3)	C1—N2	1.322 (7)
Sr1—O2	2.622 (3)	C1—N2ⁱⁱⁱ	1.322 (7)
Sr1—O6ⁱ	2.847 (5)	N4—H4A	0.8600
Sr1—O3ⁱⁱ	2.731 (4)	N4—H4B	0.8600
Sr1—N3	3.088 (4)	N4—C2	1.322 (7)
Sr1—N1	3.097 (4)	N2—H2A	0.8600
O5—N3	1.241 (5)	N2—H2B	0.8600
O7—C1	1.274 (11)

O5—Sr1—O1	163.75 (10)	O2ⁱⁱ—Sr1—N1	124.65 (11)
O5—Sr1—O6ⁱ	72.03 (13)	O6ⁱ—Sr1—N3	95.41 (13)
O5—Sr1—N3	23.62 (10)	O6ⁱ—Sr1—N1	87.87 (13)
O5—Sr1—N1	158.76 (11)	O3ⁱⁱ—Sr1—O5	101.94 (11)
O7—Sr1—O5	71.00 (11)	O3ⁱⁱ—Sr1—O1	74.45 (12)
O7—Sr1—O4ⁱ	128.84 (10)	O3ⁱⁱ—Sr1—O6ⁱ	134.94 (11)
O7—Sr1—O4	74.49 (8)	O3ⁱⁱ—Sr1—N3	87.94 (12)
O7—Sr1—O8	72.94 (8)	O3ⁱⁱ—Sr1—N1	97.10 (12)
O7—Sr1—O1	122.30 (10)	N3—Sr1—N1	169.13 (10)
O7—Sr1—O2	81.01 (8)	N3—O5—Sr1	94.1 (3)
O7—Sr1—O2ⁱⁱ	134.83 (9)	Sr1—O7—Sr1ⁱⁱⁱ	108.0 (2)
O7—Sr1—O6ⁱ	82.92 (12)	C1—O7—Sr1	126.00 (10)
O7—Sr1—O3ⁱⁱ	138.81 (11)	C1—O7—Sr1ⁱⁱⁱ	126.00 (10)
O7—Sr1—N3	69.81 (9)	Sr1—O4—Sr1^iv	156.08 (14)
O7—Sr1—N1	100.42 (9)	N3—O4—Sr1	98.9 (2)
O4—Sr1—O5	47.58 (9)	N3—O4—Sr1^iv	102.3 (2)
O4ⁱ—Sr1—O5	92.60 (10)	Sr1—O8—Sr1ⁱⁱⁱ	106.13 (19)
O4—Sr1—O4ⁱ	128.56 (4)	C2—O8—Sr1	126.94 (9)
O4—Sr1—O1	140.54 (10)	C2—O8—Sr1ⁱⁱⁱ	126.94 (9)
O4ⁱ—Sr1—O1	71.84 (10)	N1—O1—Sr1	92.1 (3)
O4—Sr1—O2ⁱⁱ	67.60 (11)	Sr1—O2—Sr1^v	158.35 (14)
O4ⁱ—Sr1—O2ⁱⁱ	66.10 (11)	N1—O2—Sr1	99.7 (2)
O4ⁱ—Sr1—O6ⁱ	46.09 (10)	N1—O2—Sr1^v	97.4 (2)
O4—Sr1—O6ⁱ	119.40 (13)	N3—O6—Sr1^iv	92.7 (3)
O4ⁱ—Sr1—O3ⁱⁱ	91.21 (11)	N1—O3—Sr1^v	97.7 (3)
O4—Sr1—O3ⁱⁱ	72.06 (12)	O7—C1—N2	120.4 (4)
O4—Sr1—N3	24.02 (9)	O7—C1—N2ⁱⁱⁱ	120.4 (4)
O4ⁱ—Sr1—N3	112.09 (11)	N2ⁱⁱⁱ—C1—N2	119.2 (8)
O4—Sr1—N1	150.61 (10)	Sr1—N3—Sr1^iv	110.78 (12)
O4ⁱ—Sr1—N1	77.56 (10)	O5—N3—Sr1^iv	172.2 (3)
O8—Sr1—O5	125.63 (9)	O5—N3—Sr1	62.2 (2)
O8—Sr1—O4	84.36 (7)	O5—N3—O4	119.1 (4)
O8—Sr1—O4ⁱ	141.75 (10)	O4—N3—Sr1^iv	54.49 (19)
O8—Sr1—O1	69.95 (10)	O4—N3—Sr1	57.1 (2)
O8—Sr1—O2	73.36 (8)	O6—N3—Sr1	173.7 (4)
O8—Sr1—O2ⁱⁱ	124.70 (9)	O6—N3—Sr1^iv	64.3 (3)
O8—Sr1—O6ⁱ	140.21 (11)	O6—N3—O5	122.4 (4)
O8—Sr1—O3ⁱⁱ	80.46 (12)	O6—N3—O4	118.5 (4)
O8—Sr1—N3	104.90 (9)	H4A—N4—H4B	120.0
O8—Sr1—N1	66.70 (8)	C2—N4—H4A	120.0
O1—Sr1—O6ⁱ	99.01 (12)	C2—N4—H4B	120.0
O1—Sr1—N3	162.17 (11)	C1—N2—H2A	120.0
O1—Sr1—N1	23.64 (11)	C1—N2—H2B	120.0
O2ⁱⁱ—Sr1—O5	65.54 (10)	H2A—N2—H2B	120.0
O2—Sr1—O5	136.45 (11)	Sr1—N1—Sr1^v	114.45 (13)
O2—Sr1—O4ⁱ	79.48 (11)	O1—N1—Sr1^v	177.6 (3)
O2—Sr1—O4	150.83 (11)	O1—N1—Sr1	64.3 (2)
O2—Sr1—O1	46.95 (10)	O1—N1—O2	119.2 (4)
O2ⁱⁱ—Sr1—O1	102.69 (11)	O2—N1—Sr1^v	59.1 (2)
O2—Sr1—O2ⁱⁱ	141.08 (5)	O2—N1—Sr1	56.5 (2)
O2ⁱⁱ—Sr1—O6ⁱ	94.76 (12)	O3—N1—Sr1	165.5 (3)
O2—Sr1—O6ⁱ	71.96 (14)	O3—N1—Sr1^v	59.3 (3)
O2—Sr1—O3ⁱⁱ	120.82 (11)	O3—N1—O1	122.4 (5)
O2ⁱⁱ—Sr1—O3ⁱⁱ	46.46 (10)	O3—N1—O2	118.4 (4)
O2ⁱⁱ—Sr1—N3	65.51 (11)	O8—C2—N4ⁱⁱⁱ	120.7 (4)
O2—Sr1—N3	149.57 (10)	O8—C2—N4	120.7 (4)
O2—Sr1—N1	23.74 (10)	N4—C2—N4ⁱⁱⁱ	118.6 (8)

Sr1—O5—N3—O4	5.5 (4)	Sr1—O8—C2—N4ⁱⁱⁱ	−117.5 (3)
Sr1—O5—N3—O6	−175.1 (4)	Sr1—O1—N1—O2	14.2 (4)
Sr1ⁱⁱⁱ—O7—C1—N2	−117.6 (4)	Sr1—O1—N1—O3	−165.2 (4)
Sr1ⁱⁱⁱ—O7—C1—N2ⁱⁱⁱ	62.4 (4)	Sr1^v—O2—N1—Sr1	−166.7 (2)
Sr1—O7—C1—N2	62.4 (4)	Sr1—O2—N1—Sr1^v	166.7 (2)
Sr1—O7—C1—N2ⁱⁱⁱ	−117.6 (4)	Sr1—O2—N1—O1	−15.3 (4)
Sr1^iv—O4—N3—Sr1	−168.9 (2)	Sr1^v—O2—N1—O1	178.0 (3)
Sr1—O4—N3—Sr1^iv	168.9 (2)	Sr1—O2—N1—O3	164.1 (3)
Sr1—O4—N3—O5	−5.8 (4)	Sr1^v—O2—N1—O3	−2.6 (4)
Sr1^iv—O4—N3—O5	−174.7 (3)	Sr1^iv—O6—N3—O5	175.3 (4)
Sr1^iv—O4—N3—O6	5.9 (5)	Sr1^iv—O6—N3—O4	−5.3 (4)
Sr1—O4—N3—O6	174.8 (4)	Sr1^v—O3—N1—Sr1	68.3 (14)
Sr1ⁱⁱⁱ—O8—C2—N4ⁱⁱⁱ	62.5 (3)	Sr1^v—O3—N1—O1	−178.0 (3)
Sr1—O8—C2—N4	62.5 (3)	Sr1^v—O3—N1—O2	2.6 (4)
Sr1ⁱⁱⁱ—O8—C2—N4	−117.5 (3)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N4—H4A···O3ⁱⁱ	0.86	2.44	2.956 (6)	119
N4—H4B···O5^vi	0.86	2.29	3.086 (6)	154
N4—H4B···O6^vi	0.86	2.59	3.304 (7)	141
N2—H2A···O6ⁱ	0.86	2.50	3.020 (6)	120
N2—H2B···O1^vii	0.86	2.33	3.139 (7)	157
N2—H2B···O3^vii	0.86	2.57	3.312 (6)	145

Symmetry codes: (i) x+1/2, −y+1/2, z; (ii) −x+3/2, y−1/2, z; (vi) −x+1, −y+1/2, z−1/2; (vii) −x+3/2, y, z+1/2.

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