A binuclear manganese(II) complex, deca­aqua([mu]-1,2,4,5-benzene­tetra­carboxyl­ato-O¹:O⁴)­di­manganese(II) hydrate

In the title Mn^II complex, [Mn₂(C₁₀H₂O₈)(H₂O)₁₀]·H₂O, two independent binuclear mol­ecules bridged by the 1,2,4,5-benzene­tetra­carboxyl anion exist in a unit cell, with each anion lying about an inversion centre. One of the Mn-O_water distances [2.2922 (13) Å] is significantly longer than the Mn^II-O_water distances reported so far for Mn^II complexes and very close to the Mn-O_water distances found in the axial direction of Mn^III complexes.

S1. Comment

As water coordination to manganese is an important step for oxygen evolution in the photosynthesis process, we are interested in the structural chemistry of manganese complexes. Some manganese complexes with water ligands have been synthesized and their molecular structures have recently been determined in our laboratory (Yin et al., 1999). We here present the structure of one such compound, (I). \sch

The crystal structure (Fig. 1), is composed of two, binuclear, crystallographically independent complex molecules (1) and (2) centered about 0,0,0 and 0,0,1/2, respectively. The benzenetetracarboxyl anion bridges two Mn^II atoms through carboxyl oxygen atoms to form the binuclear molecule. Five water molecules, together with one carboxyl oxygen atom, complete an octahedral coordination geometry around each Mn^II atom. There is no significant difference in the coordination distance between carboxyl oxygen and water oxygen atoms. Most of the coordination bond distances in the present complex range from 2.1516 (14) to 2.216 (2) Å and are comparable to those reported previously, for example 2.181 (1) Å in [Mn(H₂O)₆]²⁺ZnBr^2- (Villella et al., 1985), 2.221 (6) Å in [Mn(HC₄O₄)₂(OH₂)₄] (Yaghi et al., 1995) and 2.247 (3) Å in Mn^II(Me₂PO₂)₂·2H₂O (Cicha et al., 1985). But it is notable that the Mn1—O19 distance of 2.2922 (13) Å in the present Mn^II complex is significantly longer than the Mn^II—O(water) distances reported so far for the Mn^II complexes and very close to the Mn—O(water) distances of 2.319 (3) Å (Horwitz et al., 1995) and 2.287 (5) Å (Li et al., 1999) found in the axial direction of two Mn^III complexes, both of which showed significant Jahn-Teller distortion. Jahn-Teller distortion is not expected in Mn^II complexes. Corresponding to the longer Mn1—O19 distance of 2.2922 (13) Å in the molecule (1) there is a shorter Mn2—O29 distance of 2.1516 (14) Å in molecule (2). Both bonds are in the para-position to the coordinated carboxyl groups and the difference in the length of about 0.15 Å, is one of the significant differences between the two molecules in the unit cell. The ranges for O—Mn—O angles of the two molecules are normal. Another difference between the two molecules is the conformation of carboxyl groups, viz. the orientation of the uncoordinated oxygen atom of the coordinated carboxyl group is the same as the carboxyl group in the ortho position for the molecule (1), while is opposite to that for the molecule (2) as shown in Fig. 1.

There is an extensive network of hydrogen bonds between coordinated water molecules and including hydration water linking the complex ions. O—O distances for these interactions range from 2.563 (12) to 2.881 (12) Å.

S2. Experimental

About 5 mmol of 1,2,4,5-benzenetetracarboxylate acid was added slowly to NaOH (0.80 g, 20 mmol) aqueous solution (20 ml) with stirring at room temperature until the pH was close to 7.0. Manganese(II) acetate tetrahydrate (1.22 g, 5 mmol) was dissolved in water (10 ml). The two solutions were mixed and divided into three parts. The first part was maintained in the same condition, to the second part was added some methanol (0.5 ml), and to the last part was added some acetonitrile (0.5 ml). The above solutions were filtered, respectively, left to stand for two days, and only in diluted methanol solution well formed, colorless, single crystals were obtained.

Computing details

Program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997).

Figures

Fig. 1. The molecular structures of the title complex showing 30% probability displacement ellipsoids, the molecule 1 (left) and molecule 2 (right) being around the inverse centre at 0,0,0 and 0,0,1/2, respectively, in the unit cell. H atoms are omitted for clarity.

(I)

Crystal data

[Mn2(C10H2O8)(H2O)10]·H2O	Z = 2
Mr = 558.17	F(000) = 572
Triclinic, P1	Dx = 1.835 Mg m^−3 Dm = 1.832 (3) Mg m^−3 Dm measured by flotation
a = 9.502 (1) Å	Mo Kα radiation, λ = 0.71073 Å
b = 10.286 (1) Å	Cell parameters from 25 reflections
c = 11.289 (1) Å	θ = 10–25°
α = 87.76 (1)°	µ = 1.34 mm^−1
β = 77.48 (1)°	T = 293 K
γ = 69.85 (1)°	Hexagonal prism, colorless
V = 1010.43 (17) Å^3	0.50 × 0.48 × 0.45 mm

Data collection

Bruker AXS P4 diffractometer	4045 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	Rint = 0.017
Graphite monochromator	θmax = 27.5°, θmin = 1.9°
θ/2θ scans	h = −12→12
Absorption correction: empirical (using intensity measurements) XPREP (Siemens, 1995)	k = −13→12
Tmin = 0.476, Tmax = 0.546	l = 0→14
5471 measured reflections	3 standard reflections every 97 reflections
4628 independent reflections	intensity decay: 1.7%

Refinement

Refinement on F^2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F^2 > 2σ(F^2)] = 0.030	Hydrogen site location: difference Fourier map
wR(F^2) = 0.086	Fixed
S = 1.03	Calculated w = 1/[σ^2(Fo^2) + (0.0505P)^2 + 0.2541P] where P = (Fo^2 + 2Fc^2)/3
4628 reflections	(Δ/σ)max = 0.001
280 parameters	Δρmax = 0.41 e Å^−3
0 restraints	Δρmin = −0.32 e Å^−3

Special details

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 > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
Mn(1)	0.30780 (3)	0.25988 (2)	0.75577 (2)	0.02422 (9)
Mn(2)	0.37339 (3)	0.29080 (3)	0.26023 (2)	0.02699 (9)
O(11)	0.21279 (14)	0.16361 (13)	0.64180 (12)	0.0316 (3)
O(12)	−0.0363 (2)	0.2912 (2)	0.69159 (15)	0.0458 (4)
O(13)	−0.32692 (14)	0.32553 (13)	0.54497 (14)	0.0363 (3)
O(14)	−0.1196 (2)	0.37160 (14)	0.4544 (2)	0.0465 (4)
O(15)	0.3223 (2)	0.41431 (14)	0.62273 (13)	0.0394 (3)
O(16)	0.54123 (13)	0.14764 (13)	0.66208 (11)	0.0278 (2)
O(17)	0.3524 (2)	0.10372 (14)	0.89135 (12)	0.0400 (3)
O(18)	0.07481 (15)	0.37306 (14)	0.85453 (12)	0.0339 (3)
O(19)	0.3911 (2)	0.38460 (13)	0.87143 (12)	0.0330 (3)
O(21)	0.60323 (13)	0.17021 (13)	0.16184 (11)	0.0294 (3)
O(22)	0.73325 (15)	0.30616 (15)	0.18918 (14)	0.0423 (3)
O(23)	0.67674 (15)	0.26711 (13)	−0.09640 (12)	0.0336 (3)
O(24)	0.7254 (2)	0.06615 (13)	−0.19298 (14)	0.0399 (3)
O(25)	0.3268 (2)	0.4555 (2)	0.12664 (14)	0.0504 (4)
O(26)	0.2743 (2)	0.18876 (13)	0.15040 (13)	0.0349 (3)
O(27)	0.3992 (2)	0.13266 (15)	0.39953 (13)	0.0431 (3)
O(28)	0.45805 (15)	0.41272 (14)	0.36084 (14)	0.0381 (3)
O(29)	0.1507 (2)	0.4034 (2)	0.3694 (2)	0.0465 (4)
O(30)	0.00102 (15)	0.35080 (14)	0.10361 (13)	0.0362 (3)
C(11)	0.0739 (2)	0.1926 (2)	0.63612 (15)	0.0259 (3)
C(12)	−0.1854 (2)	0.2908 (2)	0.5035 (2)	0.0269 (3)
C(13)	0.0386 (2)	0.0958 (2)	0.55946 (14)	0.0230 (3)
C(14)	−0.0897 (2)	0.1406 (2)	0.50667 (14)	0.0226 (3)
C(15)	−0.1274 (2)	0.0441 (2)	0.44862 (14)	0.0228 (3)
C(21)	0.7234 (2)	0.2018 (2)	0.14389 (14)	0.0252 (3)
C(22)	0.7489 (2)	0.1413 (2)	−0.11911 (15)	0.0253 (3)
C(23)	0.8671 (2)	0.1006 (2)	0.06616 (14)	0.0229 (3)
C(24)	0.8773 (2)	0.0687 (2)	−0.05511 (14)	0.0233 (3)
C(25)	0.9908 (2)	0.0321 (2)	0.11986 (14)	0.0238 (3)
H(C15)	−0.2212	0.0768	0.4030	0.060*
H(C25)	0.9869	0.0595	0.2008	0.060*
H(15A)	0.2464	0.4810	0.6059	0.060*
H(15B)	0.3836	0.3941	0.5565	0.060*
H(16A)	0.6078	0.1211	0.7096	0.060*
H(16B)	0.5870	0.1950	0.6158	0.060*
H(17A)	0.3489	0.1191	0.9697	0.060*
H(17B)	0.3573	0.0237	0.8805	0.060*
H(18A)	0.0161	0.3527	0.8110	0.060*
H(18B)	0.0437	0.3553	0.9327	0.060*
H(19A)	0.3837	0.4610	0.8424	0.060*
H(19B)	0.4865	0.3570	0.8791	0.060*
H(25A)	0.3017	0.5368	0.1322	0.060*
H(25B)	0.3357	0.4380	0.0575	0.060*
H(26A)	0.1810	0.2433	0.1485	0.060*
H(26B)	0.2767	0.1010	0.1630	0.060*
H(27A)	0.3495	0.1397	0.4771	0.060*
H(27B)	0.4195	0.0573	0.3910	0.060*
H(28A)	0.5540	0.4014	0.3376	0.060*
H(28B)	0.4314	0.4957	0.3865	0.060*
H(29A)	0.0715	0.3811	0.3978	0.060*
H(29B)	0.1299	0.4882	0.4007	0.060*
H(30A)	−0.0884	0.3367	0.1334	0.060*
H(30B)	0.0029	0.4277	0.1352	0.060*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Mn(1)	0.02238 (14)	0.02463 (14)	0.02611 (14)	−0.00793 (10)	−0.00627 (9)	−0.00009 (9)
Mn(2)	0.02196 (14)	0.02539 (14)	0.03103 (15)	−0.00660 (9)	−0.00204 (10)	−0.00431 (9)
O(11)	0.0242 (6)	0.0348 (6)	0.0374 (6)	−0.0103 (5)	−0.0078 (5)	−0.0094 (5)
O(12)	0.0287 (7)	0.0425 (8)	0.0618 (9)	−0.0025 (6)	−0.0114 (6)	−0.0282 (7)
O(13)	0.0209 (6)	0.0232 (6)	0.0591 (8)	−0.0048 (5)	−0.0017 (5)	0.0027 (5)
O(14)	0.0248 (6)	0.0260 (6)	0.0841 (11)	−0.0085 (5)	−0.0051 (7)	0.0168 (7)
O(15)	0.0345 (7)	0.0361 (7)	0.0422 (7)	−0.0066 (6)	−0.0088 (6)	0.0156 (6)
O(16)	0.0239 (6)	0.0292 (6)	0.0299 (6)	−0.0080 (5)	−0.0074 (5)	0.0042 (5)
O(17)	0.0592 (9)	0.0287 (7)	0.0323 (7)	−0.0175 (6)	−0.0066 (6)	0.0048 (5)
O(18)	0.0274 (6)	0.0367 (7)	0.0359 (7)	−0.0083 (5)	−0.0057 (5)	−0.0098 (5)
O(19)	0.0318 (7)	0.0301 (6)	0.0403 (7)	−0.0106 (5)	−0.0142 (5)	0.0025 (5)
O(21)	0.0200 (5)	0.0273 (6)	0.0368 (6)	−0.0068 (5)	0.0008 (5)	−0.0039 (5)
O(22)	0.0260 (6)	0.0387 (7)	0.0577 (9)	−0.0102 (5)	0.0031 (6)	−0.0234 (6)
O(23)	0.0288 (6)	0.0261 (6)	0.0433 (7)	−0.0029 (5)	−0.0134 (5)	0.0011 (5)
O(24)	0.0433 (8)	0.0294 (6)	0.0527 (8)	−0.0071 (6)	−0.0307 (7)	0.0014 (6)
O(25)	0.0778 (12)	0.0293 (7)	0.0406 (8)	−0.0160 (7)	−0.0102 (8)	0.0034 (6)
O(26)	0.0336 (7)	0.0280 (6)	0.0449 (7)	−0.0092 (5)	−0.0140 (6)	0.0001 (5)
O(27)	0.0559 (9)	0.0309 (7)	0.0338 (7)	−0.0112 (6)	0.0021 (6)	−0.0001 (5)
O(28)	0.0259 (6)	0.0345 (7)	0.0522 (8)	−0.0096 (5)	−0.0036 (6)	−0.0138 (6)
O(29)	0.0259 (7)	0.0378 (8)	0.0684 (10)	−0.0121 (6)	0.0106 (6)	−0.0181 (7)
O(30)	0.0300 (6)	0.0327 (7)	0.0463 (7)	−0.0119 (5)	−0.0067 (6)	−0.0018 (6)
C(11)	0.0258 (8)	0.0239 (7)	0.0294 (8)	−0.0095 (6)	−0.0067 (6)	−0.0025 (6)
C(12)	0.0232 (7)	0.0202 (7)	0.0370 (9)	−0.0062 (6)	−0.0080 (6)	0.0013 (6)
C(13)	0.0213 (7)	0.0227 (7)	0.0253 (7)	−0.0082 (6)	−0.0042 (6)	−0.0013 (5)
C(14)	0.0213 (7)	0.0197 (7)	0.0260 (7)	−0.0064 (6)	−0.0042 (6)	0.0007 (5)
C(15)	0.0205 (7)	0.0221 (7)	0.0262 (7)	−0.0062 (6)	−0.0075 (6)	0.0007 (5)
C(21)	0.0201 (7)	0.0250 (7)	0.0270 (7)	−0.0041 (6)	−0.0033 (6)	−0.0027 (6)
C(22)	0.0218 (7)	0.0255 (7)	0.0291 (8)	−0.0080 (6)	−0.0071 (6)	0.0035 (6)
C(23)	0.0186 (7)	0.0222 (7)	0.0260 (7)	−0.0062 (6)	−0.0022 (5)	−0.0009 (5)
C(24)	0.0192 (7)	0.0235 (7)	0.0269 (7)	−0.0065 (6)	−0.0059 (6)	0.0015 (6)
C(25)	0.0215 (7)	0.0253 (7)	0.0230 (7)	−0.0062 (6)	−0.0046 (6)	−0.0009 (6)

Geometric parameters (Å, º)

Mn(1)—O(11)	2.1610 (12)	C(23)—C(24)	1.395 (2)
Mn(1)—O(15)	2.1616 (13)	C(23)—C(25)	1.396 (2)
Mn(1)—O(16)	2.1646 (12)	C(24)—C(25)^ii	1.395 (2)
Mn(1)—O(17)	2.1731 (14)	O(15)—H(15A)	0.857 (1)
Mn(1)—O(18)	2.1806 (13)	O(15)—H(15B)	0.827 (1)
Mn(1)—O(19)	2.2922 (13)	O(16)—H(16A)	0.883 (1)
Mn(2)—O(21)	2.1752 (12)	O(16)—H(16B)	0.853 (1)
Mn(2)—O(25)	2.216 (2)	O(17)—H(17A)	0.896 (1)
Mn(2)—O(26)	2.1941 (13)	O(17)—H(17B)	0.821 (1)
Mn(2)—O(27)	2.2071 (15)	O(18)—H(18A)	0.896 (1)
Mn(2)—O(28)	2.1707 (13)	O(18)—H(18B)	0.903 (1)
Mn(2)—O(29)	2.1516 (14)	O(19)—H(19A)	0.825 (1)
O(11)—C(11)	1.265 (2)	O(19)—H(19B)	0.875 (1)
O(12)—C(11)	1.245 (2)	O(25)—H(25A)	0.788 (1)
O(13)—C(12)	1.251 (2)	O(25)—H(25B)	0.787 (1)
O(14)—C(12)	1.249 (2)	O(26)—H(26A)	0.875 (1)
O(21)—C(21)	1.265 (2)	O(26)—H(26B)	0.902 (1)
O(22)—C(21)	1.247 (2)	O(27)—H(27A)	0.893 (1)
O(23)—C(22)	1.245 (2)	O(27)—H(27B)	0.737 (1)
O(24)—C(22)	1.262 (2)	O(28)—H(28A)	0.860 (1)
C(11)—C(13)	1.508 (2)	O(28)—H(28B)	0.845 (1)
C(12)—C(14)	1.502 (2)	O(29)—H(29A)	0.854 (1)
C(13)—C(14)	1.401 (2)	O(29)—H(29B)	0.896 (1)
C(13)—C(15)^i	1.390 (2)	O(30)—H(30A)	0.901 (1)
C(14)—C(15)	1.392 (2)	O(30)—H(30B)	0.890 (1)
C(21)—C(23)	1.513 (2)	C(15)—H(C15)	1.074 (2)
C(22)—C(24)	1.511 (2)	C(25)—H(C25)	0.956 (2)
O(11)—Mn(1)—O(15)	90.89 (6)	C(12)—C(14)—C(13)	122.75 (14)
O(11)—Mn(1)—O(16)	92.56 (5)	C(12)—C(14)—C(15)	117.64 (14)
O(11)—Mn(1)—O(17)	99.85 (5)	C(13)—C(14)—C(15)	119.52 (14)
O(11)—Mn(1)—O(18)	88.76 (5)	C(13)^i—C(15)—C(14)	121.23 (14)
O(11)—Mn(1)—O(19)	173.78 (5)	C(21)—C(23)—C(24)	122.32 (14)
O(15)—Mn(1)—O(16)	84.27 (5)	C(21)—C(23)—C(25)	118.51 (14)
O(15)—Mn(1)—O(17)	165.08 (6)	C(24)—C(23)—C(25)	119.09 (14)
O(15)—Mn(1)—O(18)	96.47 (6)	C(22)—C(24)—C(23)	121.63 (14)
O(15)—Mn(1)—O(19)	84.59 (5)	C(22)—C(24)—C(25)^ii	118.70 (14)
O(16)—Mn(1)—O(17)	84.92 (5)	C(23)—C(24)—C(25)^ii	119.67 (14)
O(16)—Mn(1)—O(18)	178.48 (5)	C(23)—C(25)—C(24)^ii	121.24 (14)
O(16)—Mn(1)—O(19)	91.24 (5)	Mn(1)—O(15)—H(15A)	126.12 (12)
O(17)—Mn(1)—O(18)	94.12 (6)	Mn(1)—O(15)—H(15B)	121.59 (12)
O(17)—Mn(1)—O(19)	85.39 (5)	H(15A)—O(15)—H(15B)	102.75 (14)
O(18)—Mn(1)—O(19)	87.52 (5)	Mn(1)—O(16)—H(16A)	114.48 (10)
O(21)—Mn(2)—O(25)	96.39 (6)	Mn(1)—O(16)—H(16B)	115.95 (10)
O(21)—Mn(2)—O(26)	90.23 (5)	H(16A)—O(16)—H(16B)	95.93 (12)
O(21)—Mn(2)—O(27)	88.12 (5)	Mn(1)—O(17)—H(17A)	126.23 (11)
O(21)—Mn(2)—O(28)	92.74 (5)	Mn(1)—O(17)—H(17B)	122.99 (12)
O(21)—Mn(2)—O(29)	175.85 (6)	H(17A)—O(17)—H(17B)	109.67 (15)
O(25)—Mn(2)—O(29)	87.41 (7)	Mn(1)—O(18)—H(18A)	103.36 (9)
O(25)—Mn(2)—O(28)	90.44 (6)	Mn(1)—O(18)—H(18B)	119.96 (11)
O(25)—Mn(2)—O(26)	83.79 (6)	H(18A)—O(18)—H(18B)	108.13 (14)
O(25)—Mn(2)—O(27)	175.28 (6)	Mn(1)—O(19)—H(19A)	110.30 (11)
O(26)—Mn(2)—O(27)	94.82 (6)	Mn(1)—O(19)—H(19B)	121.59 (11)
O(26)—Mn(2)—O(28)	173.78 (5)	H(19A)—O(19)—H(19B)	99.74 (14)
O(26)—Mn(2)—O(29)	91.85 (6)	Mn(2)—O(25)—H(25A)	132.82 (14)
O(27)—Mn(2)—O(28)	90.74 (6)	Mn(2)—O(25)—H(25B)	121.75 (13)
O(27)—Mn(2)—O(29)	88.13 (6)	H(25A)—O(25)—H(25B)	105.43 (17)
O(28)—Mn(2)—O(29)	85.54 (5)	Mn(2)—O(26)—H(26A)	109.10 (10)
C(11)—O(11)—Mn(1)	128.58 (11)	Mn(2)—O(26)—H(26B)	121.60 (11)
C(21)—O(21)—Mn(2)	128.07 (11)	H(26A)—O(26)—H(26B)	110.28 (15)
O(11)—C(11)—C(13)	116.90 (14)	Mn(2)—O(27)—H(27A)	129.36 (12)
O(12)—C(11)—O(11)	125.59 (15)	Mn(2)—O(27)—H(27B)	128.07 (14)
O(12)—C(11)—C(13)	117.46 (15)	H(27A)—O(27)—H(27B)	97.06 (14)
O(13)—C(12)—C(14)	117.81 (14)	Mn(2)—O(28)—H(28A)	115.72 (11)
O(14)—C(12)—O(13)	124.2 (2)	Mn(2)—O(28)—H(28B)	137.96 (13)
O(14)—C(12)—C(14)	117.89 (15)	H(28A)—O(28)—H(28B)	95.26 (14)
O(21)—C(21)—O(22)	125.01 (15)	Mn(2)—O(29)—H(29A)	132.69 (12)
O(21)—C(21)—C(23)	116.76 (14)	Mn(2)—O(29)—H(29B)	121.01 (11)
O(22)—C(21)—C(23)	118.16 (14)	H(29A)—O(29)—H(29B)	106.05 (14)
O(23)—C(22)—O(24)	125.7 (2)	H(30A)—O(30)—H(30B)	111.74 (14)
O(23)—C(22)—C(24)	118.83 (14)	H(C15)—C(15)—C(13)^i	117.88 (14)
O(24)—C(22)—C(24)	115.47 (14)	H(C15)—C(15)—C(14)	120.71 (14)
C(11)—C(13)—C(14)	121.72 (14)	H(C25)—C(25)—C(24)^ii	119.76 (16)
C(11)—C(13)—C(15)^i	118.72 (14)	H(C25)—C(25)—C(23)	118.81 (15)
C(14)—C(13)—C(15)^i	119.24 (14)

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

Hydrogen-bond geometry (Å)

D—H···A	D···A
O(15)···O(14)^iii	2.640 (12)
O(16)···O(13)^iv	2.709 (14)
O(16)···O(24)^v	2.563 (12)
O(17)···O(21)^vi	2.772 (12)
O(18)···O(12)	2.603 (13)
O(18)···O(30)^v	2.768 (14)
O(19)···O(23)^v	2.664 (12)
O(25)···O(19)^vii	2.881 (14)
O(25)···O(23)^viii	2.850 (15)
O(26)···O(24)^vi	2.647 (15)
O(26)···O(30)	2.710 (14)
O(27)···O(11)	2.881 (12)
O(27)···O(16)^vi	2.825 (15)
O(28)···O(13)^iii	2.696 (13)
O(28)···O(22)	2.791 (12)
O(29)···O(14)	2.667 (11)
O(30)···O(18)^iii	2.714 (15)
O(30)···O(22)^ix	2.705 (12)

Symmetry codes: (iii) −x, −y+1, −z+1; (iv) x+1, y, z; (v) x, y, z+1; (vi) −x+1, −y, −z+1; (vii) x, y, z−1; (viii) −x+1, −y+1, −z; (ix) x−1, y, z.