Crystal structure of bis­[trans-di­chlorido­bis(propane-1,3-di­amine-κ2N,N′)chromium(III)] dichromate from synchrotron data

Moon, D.; Ryoo, K.S.; Choi, J.-H.

doi:10.1107/S2056989016012755

Crystal structure of bis[trans-dichloridobis(propane-1,3-diamine-κ²N,N′)chromium(III)] dichromate from synchrotron data

In the title organic–inorganic salt, [CrCl₂(tn)₂]₂[Cr₂O₇] (tn is propane-1,3-diamine), the Cr^III ions are coordinated by four N atoms from two tn ligands and two chloride ions in a trans geometry, displaying a distorted octahedral arrangement. The crystal packing is stabilized by N—H

Cl and N—H

O hydrogen bonds.

Keywords: crystal structure; propane-1,3-diamine; chloride ligand; trans–anti conformation; chromium(III) complex; dichromate anion; hydrogen bonding; synchrotron radiation.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S2056989016012755/wm5308sup1.cif Contains datablock I
	Structure factor file (CIF format) https://doi.org/10.1107/S2056989016012755/wm5308Isup2.hkl Contains datablock I

CCDC reference: 1498083

checkCIF report

Key indicators

Single-crystal synchrotron study
T = 253 K
Mean (C-C) = 0.004 Å
Disorder in main residue
R factor = 0.037
wR factor = 0.105
Data-to-parameter ratio = 17.9

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT029_ALERT_3_C _diffrn_measured_fraction_theta_full value Low .      0.961 Note
PLAT213_ALERT_2_C Atom O3SA            has ADP max/min Ratio .....        3.3 prolat
PLAT242_ALERT_2_C Low    'MainMol' Ueq as Compared to Neighbors of        Cr2 Check
PLAT420_ALERT_2_C D-H Without Acceptor       N2     --  H2B    ...     Please Check
PLAT480_ALERT_4_C Long H...A H-Bond Reported H2B    ..  O2SB    ..       2.63 Ang.
PLAT911_ALERT_3_C Missing # FCF Refl Between THmin & STh/L=  0.600        103 Report

Alert level G
ABSMU01_ALERT_1_G  Calculation of _exptl_absorpt_correction_mu
                not performed for this radiation type.
PLAT003_ALERT_2_G Number of Uiso or Uij Restrained non-H Atoms ...          4 Report
PLAT007_ALERT_5_G Number of Unrefined Donor-H Atoms ..............          8 Report
PLAT042_ALERT_1_G Calc. and Reported MoietyFormula Strings  Differ     Please Check
PLAT066_ALERT_1_G Predicted and Reported Tmin&Tmax Range Identical          ? Check
PLAT171_ALERT_4_G The CIF-Embedded .res File Contains EADP Records          1 Report
PLAT186_ALERT_4_G The CIF-Embedded .res File Contains ISOR Records          2 Report
PLAT232_ALERT_2_G Hirshfeld Test Diff (M-X)  Cr2    --  O2SB    ..       14.0 s.u.
PLAT232_ALERT_2_G Hirshfeld Test Diff (M-X)  Cr2    --  O3SB    ..       20.0 s.u.
PLAT232_ALERT_2_G Hirshfeld Test Diff (M-X)  Cr2    --  O4SB    ..       13.5 s.u.
PLAT300_ALERT_4_G Atom Site Occupancy of >O2SA   is Constrained at        0.7 Check
PLAT300_ALERT_4_G Atom Site Occupancy of >O3SA   is Constrained at        0.7 Check
PLAT300_ALERT_4_G Atom Site Occupancy of >O4SA   is Constrained at        0.7 Check
PLAT300_ALERT_4_G Atom Site Occupancy of <O1SA   is Constrained at       0.35 Check
PLAT300_ALERT_4_G Atom Site Occupancy of <O1SB   is Constrained at       0.15 Check
PLAT300_ALERT_4_G Atom Site Occupancy of <O2SB   is Constrained at        0.3 Check
PLAT300_ALERT_4_G Atom Site Occupancy of <O3SB   is Constrained at        0.3 Check
PLAT300_ALERT_4_G Atom Site Occupancy of <O4SB   is Constrained at        0.3 Check
PLAT301_ALERT_3_G Main Residue  Disorder ............ Percentage =         31 Note
PLAT720_ALERT_4_G Number of Unusual/Non-Standard Labels ..........          8 Note
PLAT764_ALERT_4_G Overcomplete CIF Bond List Detected (Rep/Expd) .       1.17 Ratio
PLAT860_ALERT_3_G Number of Least-Squares Restraints .............         24 Note
PLAT912_ALERT_4_G Missing # of FCF Reflections Above STh/L=  0.600         60 Note
PLAT913_ALERT_3_G Missing # of Very Strong Reflections in FCF ....          1 Note
PLAT933_ALERT_2_G Number of OMIT records in Embedded RES .........          3 Note
PLAT978_ALERT_2_G Number C-C Bonds with Positive Residual Density           2 Note

   0 ALERT level A = Most likely a serious problem - resolve or explain
   0 ALERT level B = A potentially serious problem, consider carefully
   6 ALERT level C = Check. Ensure it is not caused by an omission or oversight
  26 ALERT level G = General information/check it is not something unexpected

   3 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   9 ALERT type 2 Indicator that the structure model may be wrong or deficient
   5 ALERT type 3 Indicator that the structure quality may be low
  14 ALERT type 4 Improvement, methodology, query or suggestion
   1 ALERT type 5 Informative message, check

Computing details top

Data collection: PAL BL2D-SMDC Program (Shin et al., 2016); cell refinement: HKL3000sm (Otwinowski & Minor, 1997); data reduction: HKL3000sm (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXT2014 (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015b); molecular graphics: DIAMOND 4 (Putz & Brandenburg, 2014); software used to prepare material for publication: publCIF (Westrip, 2010).

Bis[trans-dichloridobis(propane-1,3-diamine-κ²N,N')chromium(III)]dichromate top

Crystal data top

[CrCl₂(C₃H₁₀N₂)₂]₂[Cr₂O₇]	F(000) = 776
M_r = 758.32	D_x = 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

Data collection top

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

Refinement top

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(F_o²) + (0.0617P)² + 0.9892P] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.105	(Δ/σ)_max = 0.001
S = 1.10	Δρ_max = 0.67 e Å⁻³
3438 reflections	Δρ_min = −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)

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	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

Atomic displacement parameters (Å²) top

	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)

Geometric parameters (Å, º) top

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)

Symmetry code: (i) −x+2, −y+1, −z+1.

Hydrogen-bond geometry (Å, º) top

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···Cl1^iv	0.89	2.62	3.4085 (19)	149
N2—H2B···O2SB^v	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···O2SA^v	0.89	2.28	3.027 (5)	141
N3—H3B···O2SB^v	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···Cl2^vi	0.89	2.68	3.439 (2)	143

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

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Crystal structure of bis­[trans-di­chlorido­bis(propane-1,3-di­amine-κ2N,N′)chromium(III)] dichromate from synchrotron data

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Crystal structure of bis[trans-dichloridobis(propane-1,3-diamine-κ²N,N′)chromium(III)] dichromate from synchrotron data