Crystal structure of bis-[trans-di-chlorido-bis(propane-1,3-di-amine-κ2N,N')chromium(III)] dichromate from synchrotron data.

The structure of the title compound, [CrCl2(tn)2]2[Cr2O7] (tn = propane-1,3-di-amine; C3H10N2), has been determined from synchrotron data. The asymmetric unit contains one CrIII complex cation and half a [Cr2O7]2- anion. In the complex cation, the CrIII ion is coordinated by the four N atoms of two propane-1,3-di-amine (tn) ligands in the equatorial plane and by two Cl atoms in a trans configuration, displaying a distorted octa-hedral coordination sphere. The two six-membered rings in the complex cation have an anti chair-chair conformation with respect to each other. The mean Cr-N(tn) and Cr-Cl bond lengths are 2.09 (1) and 2.320 (2) Å, respectively. The slightly bent dichromate anion is disordered over two sets of sites (occupancy ratio = 0.7:0.3) and has a staggered conformation. The crystal structure is stabilized by inter-molecular hydrogen bonds involving the NH2 groups of the tn ligands as donors and the O atoms of the [Cr2O7]2- anion and chlorido ligands as acceptors.

Chemical context

Propane-1,3-di­amine (n class="Chemical">tn) can act as a bidentate ligand to a central metal ion via its two nitro­gen atoms, forming a six-membered ring. The [CrL 2(tn)2]+ (L = monodentate ligand) cation can adopt either trans or cis geometric isomers. In addition, there are two possible conformations with respect to the six-membered rings in the trans-isomer. The carbon atoms of the two chelate rings of the tn ligands can be located on the same side (syn conformer) or on opposite side (anti conformer) of the equatorial plane (Choi et al., 2012 ▸). The preference for syn- or anti-conformation in the complex cation is an area of current inter­est because infrared or electronic absorption spectroscopic methods are not useful in determining the syn or anti conformations of the six-membered chelate rings in these transition metal complexes. The different arrangements of the two six-membered chelate rings of the tn ligands may be dependent on the packing forces and counter-anions in the crystal structure.

The shapes and sizes of counter-anions also play important roles in chemical, biological and environmental processes (Gadre et al., 1992 ▸; Fabbrizzi & Poggi, 2013 ▸; Santos-Figueroa et al., 2013 ▸). The dichromate ion is environmentally important due to its high n class="Disease">toxicity and its use in industrial processes (Yusof & Malek, 2009 ▸; Goyal et al., 2003 ▸). Here, we report on the synthesis and structure of [CrCl2(tn)2]2(Cr2O7), (I), in order to determine the conformations of the two six-membered chelate rings of the tn ligands and of the [Cr2O7]2− anion.

Structural commentary

The structure of (I) shows another example of a trans-n class="Chemical">[CrCl2(tn)2]+ cation but with a different counter-anion (Kou et al., 2001 ▸; Choi & Clegg, 2011 ▸; Moon et al., 2012 ▸). The asymmetric unit comprises one CrIII complex cation and half a [Cr2O7]2− anion, the other half being completed by inversion symmetry. In the complex cation, the four nitro­gen atoms of the two tn ligands occupy the equatorial sites and two chlorine atoms coordinate to the Cr metal centre in a trans configuration. The CrIII complex cation and the anion in the title compound are depicted in Fig. 1 ▸. The two six-membered rings involving the tn ligands have stable chair conformations. The two chelate rings in the CrIII complex cation adopt the anti chair–chair conformation with respect to each other. The Cr—N(tn) bond lengths [range 2.0814 (19) to 2.1020 (19) Å] are in good agreement with the distances found in trans-[CrCl2(tn)2]ClO4 (Choi & Clegg, 2011 ▸) or trans-[CrCl2(tn)2]2ZnCl4 (Moon et al. 2012 ▸). As expected, the average Cr—Cl distance of 2.320 (2) Å is longer than that of Cr—F found in trans-[CrF2(tn)2]ClO4 (2.085 (4) Å; Vaughn & Rogers, 1985 ▸), and slightly shorter than of Cr—Br found in trans-[CrBr2(tn)2]ClO4 [2.4681 (4) Å; Choi et al., 2012 ▸]. The bond angles of the two six-membered chelate rings around the CrIII atom are 90.07 (8) and 91.25 (8)°. The other N—C and C—C bond lengths and Cr—N—C, N—C—C and C—C—C angles are also of usual values for tn ligands in chair conformations (Choi & Clegg, 2011 ▸; Moon et al., 2012 ▸). The [Cr2O7]2− counter-anion is positionally disordered and remains outside the coordination sphere of the CrIII cation. It is of inter­est to compare the conformation of the [Cr2O7]2− anion with that found in other ionic crystals. The [Cr2O7]2− anion in compound (I) is in a staggered conformation, in contrast to that observed in K2Cr2O7. In the latter, two nearly tetra­hedral CrO4 groups are in an almost eclipsed conformation (Brandon & Brown, 1968 ▸), when viewed along the backbone of the dichromate anion. In (I), the O—Cr2—O bond angles of the major disordered component range from 102.3 (2) to 122.2 (8), while the terminal Cr2—O bond lengths vary from 1.554 (3) to 1.639 (4) Å, with a mean terminal Cr2—O bond length of 1.60 (4) Å. The bridging Cr2—O1SA bond has a length of 1.729 (15) Å, with a Cr2—O2S—Cr2 bond angle of 160.1 (4) Å. These values are comparable to those reported for [Cr(urea)6](Cr2O7)Br·H2O (Moon et al., 2015 ▸). A further distortion of the anion is due to its involvement in hydrogen-bonding inter­actions.

Figure 1

A perspective drawing of the complex cation and the anion with displacement ellipsoids at the 30% probability level. The primed atoms are related by symmetry code (−x + 2, −y + 1, −z + 1). Atoms of the minor disorder component have been omitted for clarity.

Supra­molecular features

The cations and anions in the crystal structure are held tog­ether by n class="Chemical">hydrogen bonds (Table 1 ▸) between the NH2 donor groups of the tn ligand and Cl ligands and O atoms of the dichromate anion as acceptor groups. An extensive array of these contacts generate a three-dimensional network of mol­ecules stacked along the a-axis direction (Fig. 2 ▸).

Table 1

Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1A⋯O4SA i	0.89	2.29	3.076 (4)	147
N1—H1A⋯O4SB i	0.89	2.08	2.877 (14)	149
N1—H1B⋯O2SA ii	0.89	2.19	3.022 (4)	156
N1—H1B⋯O3SB ii	0.89	2.39	3.182 (16)	149
N2—H2A⋯Cl1iii	0.89	2.62	3.4085 (19)	149
N2—H2B⋯O2SB iv	0.89	2.63	3.070 (15)	111
N3—H3A⋯O3SA v	0.89	2.20	3.017 (5)	153
N3—H3A⋯O4SB v	0.89	2.21	2.933 (14)	138
N3—H3B⋯O2SA iv	0.89	2.28	3.027 (5)	141
N3—H3B⋯O2SB iv	0.89	2.13	2.989 (16)	162
N4—H4A⋯O3SA i	0.89	2.25	3.044 (4)	149
N4—H4A⋯O4SB i	0.89	2.42	3.220 (14)	150
N4—H4B⋯Cl2vi	0.89	2.68	3.439 (2)	143

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) ; (vi) .

Figure 2

The crystal packing of complex (I), viewed along the a-axis direction. Dashed lines represent N—H⋯O (pink) and N—H⋯Cl (cyan) hydrogen-bonding inter­actions.

Database survey

A search of the Cambridge Structural Database (Version 5.37, Feb 2016 with two updates; Groom et al., 2016 ▸) indicates a total of 17 hits for n class="Chemical">CrIII complexes containing two bidentate propane-1,3-di­amine ligands. The crystal structures of trans-[CrCl2(tn)2]ClO4 (Choi & Clegg, 2011 ▸), trans-[CrCl2(tn)2]2ZnCl4 (Moon et al., 2012 ▸) and trans-[CrCl2(tn)2]3[Fe(CN)6]·6H2O (Kou et al., 2001 ▸) have been reported previously. However, no structure of trans-[CrCl2(tn)2]+ with the [Cr2O7]2− anion has been deposited.

Synthesis and crystallization

The free ligand propane-1,3-di­amine was obtained from Aldrich Chemical Co. and used as supplied. All other chemicals were reagent grade materials and used without further purification. As starting materials, n class="Chemical">trans-[CrCl2(tn)2]ClO4 was prepared as described in the literature (House, 1970 ▸; Choi & Clegg, 2011 ▸). The crude perchlorate salt (0.117 g) was dissolved in 10 mL of water at room temperature and added 5 mL of water containing 0.05 g of solid K2Cr2O7. The resulting solution was filtered and allowed to stand for two days to give green crystals of the dichromate salt suitable for X-ray structural analysis.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. All n class="Disease">H atoms were placed in geometrically idealized positions and constrained to ride on their parent atoms, with C—H distances of 0.97 Å, and N—H distances of 0.89 Å, and with U iso(H) values of 1.2U eq of the parent atoms. The dichromate anion is positionally disordered over two sets of sites. In a first step, the occupancies of respective pairs, O1SA/O1SB, O2SA/O2SB, O3SA/O3SB and O4SA/O4SB, were refined freely and subsequently fixed at a ratio of 0.7:0.3. The bridging atoms O1SA/O1SB sites were refined using EXYZ/EADP commands; for O3SA, O2SB, O3SB and O4SB atoms ISOR restraints were applied.

Table 2

Experimental details

Crystal data
Chemical formula	[CrCl2(C3H10N2)2]2[Cr2O7]
M r	758.32
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	253
a, b, c (Å)	6.5240 (13), 17.350 (4), 12.901 (3)
β (°)	97.18 (3)
V (Å3)	1448.8 (5)
Z	2
Radiation type	Synchrotron, λ = 0.610 Å
μ (mm−1)	1.22
Crystal size (mm)	0.13 × 0.10 × 0.09
Data collection
Diffractometer	ADSC Q210 CCD area detector
Absorption correction	Empirical (using intensity measurements) (HKL3000sm SCALEPACK; Otwinowski & Minor, 1997 ▸)
T min, T max	0.862, 0.897
No. of measured, independent and observed [I > 2σ(I)] reflections	13070, 3438, 3059
R int	0.019
(sin θ/λ)max (Å−1)	0.667
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.037, 0.105, 1.10
No. of reflections	3438
No. of parameters	192
No. of restraints	24
H-atom treatment	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.67, −0.96

Computer programs: PAL BL2D-SMDC (Shin et al., 2016 ▸), HKL3000sm (Otwinowski & Minor, 1997 ▸), SHELXT2014 (Sheldrick, 2015a ▸), SHELXL2014 (Sheldrick, 2015b ▸), DIAMOND 4 (Putz & Brandenburg, 2014 ▸) and publCIF (Westrip, 2010 ▸).

Crystal structure: contains datablock(s) I. DOI: 10.1107/S2056989016012755/wm5308sup1.cif

Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989016012755/wm5308Isup2.hkl

CCDC reference: 1498083

Additional supporting information: crystallographic information; 3D view; checkCIF report

[CrCl2(C3H10N2)2]2[Cr2O7]	F(000) = 776
Mr = 758.32	Dx = 1.738 Mg m−3
Monoclinic, P21/c	Synchrotron radiation, λ = 0.610 Å
a = 6.5240 (13) Å	Cell parameters from 48108 reflections
b = 17.350 (4) Å	θ = 0.4–33.7°
c = 12.901 (3) Å	µ = 1.22 mm−1
β = 97.18 (3)°	T = 253 K
V = 1448.8 (5) Å3	Plate, green
Z = 2	0.13 × 0.10 × 0.09 mm

ADSC Q210 CCD area detector diffractometer	3059 reflections with I > 2σ(I)
Radiation source: PLSII 2D bending magnet	Rint = 0.019
ω scan	θmax = 24.0°, θmin = 1.7°
Absorption correction: empirical (using intensity measurements) (HKL3000sm SCALEPACK; Otwinowski & Minor, 1997)	h = −8→8
Tmin = 0.862, Tmax = 0.897	k = −23→23
13070 measured reflections	l = −16→16
3438 independent reflections

Refinement on F2	Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: full	H-atom parameters constrained
R[F2 > 2σ(F2)] = 0.037	w = 1/[σ2(Fo2) + (0.0617P)2 + 0.9892P] where P = (Fo2 + 2Fc2)/3
wR(F2) = 0.105	(Δ/σ)max = 0.001
S = 1.10	Δρmax = 0.67 e Å−3
3438 reflections	Δρmin = −0.96 e Å−3
192 parameters	Extinction correction: SHELXL2014 (Sheldrick, 2015b), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4
24 restraints	Extinction coefficient: 0.025 (3)

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.

	x	y	z	Uiso*/Ueq	Occ. (<1)
Cr1	0.49736 (4)	0.22092 (2)	0.64090 (2)	0.01917 (12)
Cl1	0.74178 (8)	0.17096 (3)	0.54341 (5)	0.03402 (16)
Cl2	0.26188 (9)	0.27054 (4)	0.74422 (5)	0.04056 (18)
N1	0.4818 (3)	0.11569 (11)	0.71701 (16)	0.0333 (4)
H1A	0.6004	0.1094	0.7584	0.040*
H1B	0.3827	0.1194	0.7583	0.040*
N2	0.2575 (3)	0.18582 (11)	0.52655 (15)	0.0281 (4)
H2A	0.1386	0.1968	0.5504	0.034*
H2B	0.2639	0.2150	0.4704	0.034*
N3	0.5108 (4)	0.32459 (11)	0.56009 (17)	0.0355 (4)
H3A	0.5997	0.3180	0.5138	0.043*
H3B	0.3871	0.3320	0.5238	0.043*
N4	0.7385 (3)	0.25541 (12)	0.75231 (14)	0.0288 (4)
H4A	0.7266	0.2293	0.8107	0.035*
H4B	0.8559	0.2404	0.7301	0.035*
C1	0.4434 (4)	0.04454 (13)	0.6542 (2)	0.0386 (5)
H1C	0.4386	0.0009	0.7008	0.046*
H1D	0.5571	0.0364	0.6137	0.046*
C2	0.2426 (4)	0.04817 (15)	0.5807 (2)	0.0420 (6)
H2C	0.2113	−0.0029	0.5524	0.050*
H2D	0.1319	0.0629	0.6204	0.050*
C3	0.2471 (4)	0.10400 (14)	0.4914 (2)	0.0355 (5)
H3C	0.3660	0.0928	0.4557	0.043*
H3D	0.1241	0.0967	0.4418	0.043*
C4	0.5687 (5)	0.39723 (14)	0.6173 (2)	0.0429 (6)
H4C	0.4614	0.4110	0.6596	0.051*
H4D	0.5799	0.4385	0.5676	0.051*
C5	0.7716 (4)	0.38861 (15)	0.6867 (2)	0.0419 (6)
H5A	0.8729	0.3674	0.6456	0.050*
H5B	0.8194	0.4393	0.7104	0.050*
C6	0.7610 (4)	0.33802 (15)	0.78056 (19)	0.0366 (5)
H6A	0.8857	0.3449	0.8291	0.044*
H6B	0.6446	0.3538	0.8156	0.044*
Cr2	1.00840 (7)	0.57351 (2)	0.59016 (4)	0.03941 (15)
O1SA	1.0285 (19)	0.4915 (6)	0.5165 (9)	0.064 (2)	0.35
O2SA	0.7745 (6)	0.5919 (3)	0.6061 (3)	0.0760 (12)	0.7
O3SA	1.1407 (11)	0.6446 (3)	0.5675 (4)	0.099 (2)	0.7
O4SA	1.1024 (7)	0.5391 (3)	0.7046 (3)	0.0930 (16)	0.7
O1SB	1.0285 (19)	0.4915 (6)	0.5165 (9)	0.064 (2)	0.15
O2SB	0.937 (2)	0.6545 (9)	0.5161 (12)	0.112 (4)	0.3
O3SB	0.932 (3)	0.5716 (9)	0.6899 (13)	0.118 (4)	0.3
O4SB	1.239 (2)	0.6098 (8)	0.5919 (11)	0.089 (4)	0.3

	U11	U22	U33	U12	U13	U23
Cr1	0.01447 (17)	0.02308 (18)	0.0206 (2)	−0.00022 (10)	0.00483 (11)	0.00014 (11)
Cl1	0.0215 (3)	0.0465 (3)	0.0364 (3)	−0.0014 (2)	0.0128 (2)	−0.0111 (2)
Cl2	0.0256 (3)	0.0509 (4)	0.0486 (4)	−0.0003 (2)	0.0181 (2)	−0.0147 (3)
N1	0.0381 (11)	0.0329 (9)	0.0292 (10)	−0.0018 (8)	0.0055 (8)	0.0069 (7)
N2	0.0188 (8)	0.0314 (9)	0.0331 (10)	0.0013 (7)	−0.0005 (7)	−0.0009 (7)
N3	0.0473 (12)	0.0274 (9)	0.0316 (11)	−0.0024 (8)	0.0036 (8)	0.0026 (7)
N4	0.0233 (8)	0.0405 (10)	0.0225 (9)	−0.0040 (7)	0.0022 (6)	−0.0018 (7)
C1	0.0441 (14)	0.0248 (10)	0.0466 (15)	0.0000 (9)	0.0042 (11)	0.0077 (9)
C2	0.0361 (13)	0.0321 (12)	0.0574 (17)	−0.0112 (10)	0.0040 (11)	−0.0004 (11)
C3	0.0301 (11)	0.0350 (11)	0.0392 (13)	−0.0029 (9)	−0.0040 (9)	−0.0075 (9)
C4	0.0559 (16)	0.0247 (11)	0.0493 (16)	−0.0052 (10)	0.0117 (12)	−0.0018 (10)
C5	0.0447 (14)	0.0348 (12)	0.0488 (16)	−0.0144 (10)	0.0165 (11)	−0.0086 (10)
C6	0.0339 (12)	0.0461 (13)	0.0306 (13)	−0.0121 (10)	0.0081 (9)	−0.0142 (10)
Cr2	0.0402 (3)	0.0366 (2)	0.0431 (3)	−0.00926 (16)	0.01182 (18)	−0.01372 (16)
O1SA	0.072 (7)	0.044 (5)	0.074 (7)	0.000 (3)	0.000 (4)	−0.029 (4)
O2SA	0.052 (2)	0.108 (3)	0.069 (3)	0.031 (2)	0.0139 (17)	−0.021 (2)
O3SA	0.173 (5)	0.062 (2)	0.076 (3)	−0.078 (3)	0.074 (3)	−0.033 (2)
O4SA	0.077 (3)	0.112 (4)	0.078 (3)	−0.035 (3)	−0.039 (2)	0.023 (3)
O1SB	0.072 (7)	0.044 (5)	0.074 (7)	0.000 (3)	0.000 (4)	−0.029 (4)
O2SB	0.112 (4)	0.111 (4)	0.112 (4)	0.0009 (10)	0.0136 (11)	0.0006 (10)
O3SB	0.118 (4)	0.118 (4)	0.118 (4)	−0.0005 (10)	0.0163 (12)	−0.0006 (10)
O4SB	0.088 (4)	0.089 (4)	0.089 (4)	−0.0013 (10)	0.0110 (11)	−0.0013 (10)

Cr1—N1	2.0814 (19)	C3—H3C	0.9700
Cr1—N4	2.0816 (19)	C3—H3D	0.9700
Cr1—N3	2.086 (2)	C4—C5	1.509 (4)
Cr1—N2	2.1020 (19)	C4—H4C	0.9700
Cr1—Cl1	2.3189 (8)	C4—H4D	0.9700
Cr1—Cl2	2.3216 (8)	C5—C6	1.504 (4)
N1—C1	1.481 (3)	C5—H5A	0.9700
N1—H1A	0.8900	C5—H5B	0.9700
N1—H1B	0.8900	C6—H6A	0.9700
N2—C3	1.489 (3)	C6—H6B	0.9700
N2—H2A	0.8900	Cr2—O3SB	1.437 (16)
N2—H2B	0.8900	Cr2—O3SA	1.554 (3)
N3—C4	1.486 (3)	Cr2—O2SA	1.597 (4)
N3—H3A	0.8900	Cr2—O4SB	1.629 (14)
N3—H3B	0.8900	Cr2—O4SA	1.639 (4)
N4—C6	1.482 (3)	Cr2—O1SB	1.725 (12)
N4—H4A	0.8900	Cr2—O1SA	1.725 (12)
N4—H4B	0.8900	Cr2—O2SB	1.729 (15)
C1—C2	1.519 (4)	Cr2—O1SBi	1.772 (12)
C1—H1C	0.9700	Cr2—O1SAi	1.772 (12)
C1—H1D	0.9700	O1SA—O1SAi	0.607 (12)
C2—C3	1.509 (4)	O1SA—Cr2i	1.772 (12)
C2—H2C	0.9700	O1SB—O1SBi	0.607 (12)
C2—H2D	0.9700	O1SB—Cr2i	1.772 (12)
N1—Cr1—N4	90.20 (8)	N2—C3—C2	112.6 (2)
N1—Cr1—N3	178.19 (8)	N2—C3—H3C	109.1
N4—Cr1—N3	91.25 (8)	C2—C3—H3C	109.1
N1—Cr1—N2	90.07 (8)	N2—C3—H3D	109.1
N4—Cr1—N2	179.02 (7)	C2—C3—H3D	109.1
N3—Cr1—N2	88.46 (8)	H3C—C3—H3D	107.8
N1—Cr1—Cl1	90.30 (6)	N3—C4—C5	111.1 (2)
N4—Cr1—Cl1	88.31 (6)	N3—C4—H4C	109.4
N3—Cr1—Cl1	88.66 (7)	C5—C4—H4C	109.4
N2—Cr1—Cl1	90.75 (6)	N3—C4—H4D	109.4
N1—Cr1—Cl2	88.84 (6)	C5—C4—H4D	109.4
N4—Cr1—Cl2	89.66 (6)	H4C—C4—H4D	108.0
N3—Cr1—Cl2	92.26 (7)	C6—C5—C4	114.2 (2)
N2—Cr1—Cl2	91.29 (6)	C6—C5—H5A	108.7
Cl1—Cr1—Cl2	177.79 (3)	C4—C5—H5A	108.7
C1—N1—Cr1	119.21 (15)	C6—C5—H5B	108.7
C1—N1—H1A	107.5	C4—C5—H5B	108.7
Cr1—N1—H1A	107.5	H5A—C5—H5B	107.6
C1—N1—H1B	107.5	N4—C6—C5	112.30 (19)
Cr1—N1—H1B	107.5	N4—C6—H6A	109.1
H1A—N1—H1B	107.0	C5—C6—H6A	109.1
C3—N2—Cr1	119.45 (14)	N4—C6—H6B	109.1
C3—N2—H2A	107.5	C5—C6—H6B	109.1
Cr1—N2—H2A	107.5	H6A—C6—H6B	107.9
C3—N2—H2B	107.5	O3SA—Cr2—O2SA	115.3 (3)
Cr1—N2—H2B	107.5	O3SB—Cr2—O4SB	114.8 (8)
H2A—N2—H2B	107.0	O3SA—Cr2—O4SA	107.8 (3)
C4—N3—Cr1	120.46 (17)	O2SA—Cr2—O4SA	102.3 (2)
C4—N3—H3A	107.2	O3SB—Cr2—O1SB	122.2 (8)
Cr1—N3—H3A	107.2	O4SB—Cr2—O1SB	101.1 (7)
C4—N3—H3B	107.2	O3SA—Cr2—O1SA	118.0 (6)
Cr1—N3—H3B	107.2	O2SA—Cr2—O1SA	112.0 (5)
H3A—N3—H3B	106.8	O4SA—Cr2—O1SA	98.6 (3)
C6—N4—Cr1	119.42 (15)	O3SB—Cr2—O2SB	114.5 (8)
C6—N4—H4A	107.5	O4SB—Cr2—O2SB	82.9 (7)
Cr1—N4—H4A	107.5	O1SB—Cr2—O2SB	113.6 (6)
C6—N4—H4B	107.5	O3SB—Cr2—O1SBi	130.7 (8)
Cr1—N4—H4B	107.5	O4SB—Cr2—O1SBi	107.0 (7)
H4A—N4—H4B	107.0	O1SB—Cr2—O1SBi	19.9 (4)
N1—C1—C2	112.4 (2)	O2SB—Cr2—O1SBi	95.0 (6)
N1—C1—H1C	109.1	O3SA—Cr2—O1SAi	112.5 (5)
C2—C1—H1C	109.1	O2SA—Cr2—O1SAi	100.8 (5)
N1—C1—H1D	109.1	O4SA—Cr2—O1SAi	117.9 (3)
C2—C1—H1D	109.1	O1SA—Cr2—O1SAi	19.9 (4)
H1C—C1—H1D	107.9	O1SAi—O1SA—Cr2	84 (2)
C3—C2—C1	113.9 (2)	O1SAi—O1SA—Cr2i	76 (2)
C3—C2—H2C	108.8	Cr2—O1SA—Cr2i	160.1 (4)
C1—C2—H2C	108.8	O1SBi—O1SB—Cr2	84 (2)
C3—C2—H2D	108.8	O1SBi—O1SB—Cr2i	76 (2)
C1—C2—H2D	108.8	Cr2—O1SB—Cr2i	160.1 (4)
H2C—C2—H2D	107.7
Cr1—N1—C1—C2	−58.0 (3)	O3SA—Cr2—O1SA—Cr2i	−79 (3)
N1—C1—C2—C3	69.9 (3)	O2SA—Cr2—O1SA—Cr2i	59 (3)
Cr1—N2—C3—C2	55.6 (2)	O4SA—Cr2—O1SA—Cr2i	166 (3)
C1—C2—C3—N2	−68.5 (3)	O1SAi—Cr2—O1SA—Cr2i	−0.002 (7)
Cr1—N3—C4—C5	53.7 (3)	O3SB—Cr2—O1SB—O1SBi	122 (3)
N3—C4—C5—C6	−71.0 (3)	O4SB—Cr2—O1SB—O1SBi	−109 (3)
Cr1—N4—C6—C5	−54.5 (2)	O2SB—Cr2—O1SB—O1SBi	−22 (3)
C4—C5—C6—N4	72.2 (3)	O3SB—Cr2—O1SB—Cr2i	122 (3)
O3SA—Cr2—O1SA—O1SAi	−79 (3)	O4SB—Cr2—O1SB—Cr2i	−109 (3)
O2SA—Cr2—O1SA—O1SAi	59 (3)	O2SB—Cr2—O1SB—Cr2i	−22 (3)
O4SA—Cr2—O1SA—O1SAi	166 (3)	O1SBi—Cr2—O1SB—Cr2i	−0.002 (7)

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1A···O4SAii	0.89	2.29	3.076 (4)	147
N1—H1A···O4SBii	0.89	2.08	2.877 (14)	149
N1—H1B···O2SAiii	0.89	2.19	3.022 (4)	156
N1—H1B···O3SBiii	0.89	2.39	3.182 (16)	149
N2—H2A···Cl1iv	0.89	2.62	3.4085 (19)	149
N2—H2B···O2SBv	0.89	2.63	3.070 (15)	111
N3—H3A···O3SAi	0.89	2.20	3.017 (5)	153
N3—H3A···O4SBi	0.89	2.21	2.933 (14)	138
N3—H3B···O2SAv	0.89	2.28	3.027 (5)	141
N3—H3B···O2SBv	0.89	2.13	2.989 (16)	162
N4—H4A···O3SAii	0.89	2.25	3.044 (4)	149
N4—H4A···O4SBii	0.89	2.42	3.220 (14)	150
N4—H4B···Cl2vi	0.89	2.68	3.439 (2)	143