μ-Oxo-bis{diethoxy­[salicyl­aldoximato(2–)]­niobium(V)}

The doubly deprotonated (C₇H₅NO₂) groups in the title compound, [Nb₂O(C₇H₅NO₂)₂(C₂H₅O)₄], use the phenoxy O and imino N atoms to chelate to one Nb atom and the oximato O atom to bond to the other Nb atom; the two Nb atoms are six-coordinate in an octahedral geometry.

Key indicators

• Single-crystal X-ray study
• T = 173 K
• Mean [sigma](C-C) = 0.004 Å
• R factor = 0.021
• wR factor = 0.060
• Data-to-parameter ratio = 17.0

checkCIF/PLATON results

No syntax errors found



Alert level B
PLAT230_ALERT_2_B Hirshfeld Test Diff for    O8     -   C21      =       7.41 su

Alert level C
PLAT220_ALERT_2_C Large Non-Solvent    C     Ueq(max)/Ueq(min) ...       3.02 Ratio
PLAT222_ALERT_3_C Large Non-Solvent    H     Ueq(max)/Ueq(min) ...       3.52 Ratio
PLAT702_ALERT_1_C Angle   Calc    93.84(5), Rep   93.90(10), Dev..       1.20 Sigma
              O1   -NB1  -O6      1.555   1.555   1.555

   0 ALERT level A = In general: serious problem
   1 ALERT level B = Potentially serious problem
   3 ALERT level C = Check and explain
   0 ALERT level G = General alerts; check

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

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Computing details

Data collection: SMART (Bruker, 2001); cell refinement: SMART; data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEPII (Johnson, 1976); software used to prepare material for publication: SHELXL97.

µ-Oxo-bis{diethoxy[salicylaldoximato(2-)]niobium(V)}

Crystal data

[Nb2O(C7H5NO2)2(C2H5O)4]	Z = 2
Mr = 652.30	F(000) = 660
Triclinic, P1	Dx = 1.622 Mg m^−3
Hall symbol: -P 1	Mo Kα radiation, λ = 0.71073 Å
a = 10.8119 (7) Å	Cell parameters from 7063 reflections
b = 12.1443 (8) Å	θ = 2.3–26.6°
c = 12.2344 (8) Å	µ = 0.91 mm^−1
α = 63.679 (1)°	T = 173 K
β = 68.124 (1)°	Block, orange
γ = 79.095 (1)°	0.50 × 0.50 × 0.20 mm
V = 1335.63 (15) Å^3

Data collection

Siemens P4/CCD area-detector diffractometer	5367 independent reflections
Radiation source: normal-focus sealed tube	4675 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.017
φ and ω scans	θmax = 26.6°, θmin = 1.9°
Absorption correction: multi-scan (SADABS; Sheldrick, 1996)	h = −13→13
Tmin = 0.660, Tmax = 0.831	k = −14→15
16798 measured reflections	l = −15→15

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)] = 0.021	Hydrogen site location: inferred from neighbouring sites
wR(F^2) = 0.060	H-atom parameters constrained
S = 1.03	w = 1/[σ^2(Fo^2) + (0.0412P)^2] where P = (Fo^2 + 2Fc^2)/3
5367 reflections	(Δ/σ)max < 0.001
316 parameters	Δρmax = 0.62 e Å^−3
0 restraints	Δρmin = −0.55 e Å^−3

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

	x	y	z	Uiso*/Ueq
Nb1	0.75546 (2)	0.87056 (2)	0.79634 (2)	0.02052 (6)
Nb2	0.65168 (2)	0.69048 (2)	0.69061 (2)	0.02242 (6)
O1	0.7807 (1)	1.0484 (1)	0.7272 (1)	0.0268 (3)
O2	0.5722 (1)	0.8671 (1)	0.6444 (1)	0.0268 (3)
O3	0.8970 (1)	0.8118 (1)	0.8659 (1)	0.0293 (3)
O4	0.6085 (1)	0.8696 (1)	0.9418 (1)	0.0303 (3)
O5	0.6755 (1)	0.7086 (1)	0.5160 (1)	0.0283 (3)
O6	0.8875 (1)	0.8543 (1)	0.6304 (1)	0.0283 (3)
O7	0.4845 (2)	0.6164 (1)	0.7792 (1)	0.0329 (3)
O8	0.7638 (2)	0.5480 (1)	0.7291 (2)	0.0400 (4)
O9	0.6862 (1)	0.7241 (1)	0.8165 (1)	0.0241 (3)
N1	0.6278 (2)	0.9519 (2)	0.6591 (2)	0.0233 (3)
N2	0.8409 (2)	0.8103 (2)	0.5659 (2)	0.0246 (3)
C1	0.7379 (2)	1.1602 (2)	0.6549 (2)	0.0240 (4)
C2	0.7737 (2)	1.2666 (2)	0.6538 (2)	0.0303 (5)
C3	0.7329 (2)	1.3823 (2)	0.5793 (2)	0.0348 (5)
C4	0.6588 (2)	1.3948 (2)	0.5020 (2)	0.0377 (5)
C5	0.6221 (2)	1.2907 (2)	0.5027 (2)	0.0334 (5)
C6	0.6584 (2)	1.1714 (2)	0.5814 (2)	0.0249 (4)
C7	0.6099 (2)	1.0653 (2)	0.5839 (2)	0.0258 (4)
C8	1.0185 (2)	0.7399 (2)	0.8542 (3)	0.0440 (6)
C9	1.1381 (3)	0.8181 (3)	0.7710 (3)	0.0688 (9)
C10	0.4794 (3)	0.8235 (3)	1.0240 (3)	0.0560 (7)
C11	0.3731 (3)	0.8863 (3)	0.9657 (3)	0.0610 (8)
C12	0.7526 (2)	0.7595 (2)	0.3909 (2)	0.0246 (4)
C13	0.7176 (2)	0.7470 (2)	0.2971 (2)	0.0278 (4)
C14	0.7968 (2)	0.7960 (2)	0.1680 (2)	0.0336 (5)
C15	0.9115 (2)	0.8585 (2)	0.1296 (2)	0.0354 (5)
C16	0.9458 (2)	0.8747 (2)	0.2206 (2)	0.0312 (5)
C17	0.8669 (2)	0.8258 (2)	0.3528 (2)	0.0252 (4)
C18	0.9036 (2)	0.8515 (2)	0.4432 (2)	0.0259 (4)
C19	0.3888 (3)	0.5384 (3)	0.8896 (2)	0.0486 (7)
C20	0.3118 (3)	0.4742 (3)	0.8548 (3)	0.0537 (7)
C21	0.8616 (3)	0.4881 (3)	0.7906 (3)	0.0529 (7)
C22	0.9938 (3)	0.4998 (3)	0.6927 (3)	0.0730 (9)
H2	0.8260	1.2591	0.7044	0.036*
H3	0.7556	1.4533	0.5808	0.042*
H4	0.6335	1.4742	0.4491	0.045*
H5	0.5720	1.2997	0.4497	0.040*
H7	0.5623	1.0803	0.5269	0.031*
H8a	1.0162	0.6832	0.8168	0.053*
H8b	1.0261	0.6897	0.9411	0.053*
H9a	1.2189	0.7655	0.7657	0.103*
H9b	1.1417	0.8734	0.8086	0.103*
H9c	1.1320	0.8667	0.6843	0.103*
H10a	0.4577	0.8330	1.1055	0.067*
H10b	0.4806	0.7345	1.0456	0.067*
H11a	0.2869	0.8510	1.0269	0.092*
H11b	0.3923	0.8751	0.8863	0.092*
H11c	0.3701	0.9742	0.9454	0.092*
H13	0.6393	0.7049	0.3221	0.033*
H14	0.7725	0.7868	0.1055	0.040*
H15	0.9664	0.8901	0.0415	0.043*
H16	1.0229	0.9191	0.1937	0.037*
H18	0.9780	0.9016	0.4093	0.031*
H19a	0.3260	0.5874	0.9349	0.058*
H19b	0.4340	0.4762	0.9493	0.058*
H20a	0.2456	0.4216	0.9335	0.081*
H20b	0.3735	0.4238	0.8123	0.081*
H20c	0.2665	0.5356	0.7962	0.081*
H21a	0.8411	0.4001	0.8439	0.063*
H21b	0.8605	0.5258	0.8480	0.063*
H22a	1.0609	0.4585	0.7351	0.109*
H22b	1.0141	0.5870	0.6407	0.109*
H22c	0.9946	0.4616	0.6366	0.109*

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
Nb1	0.0220 (1)	0.0245 (1)	0.0177 (1)	−0.0026 (1)	−0.0066 (1)	−0.0100 (1)
Nb2	0.0247 (1)	0.0253 (1)	0.0190 (1)	−0.0063 (1)	−0.0050 (1)	−0.0102 (1)
O1	0.030 (1)	0.027 (1)	0.028 (1)	−0.005 (1)	−0.013 (1)	−0.011 (1)
O2	0.028 (1)	0.027 (1)	0.034 (1)	−0.005 (1)	−0.015 (1)	−0.013 (1)
O3	0.029 (1)	0.038 (1)	0.028 (1)	0.003 (1)	−0.014 (1)	−0.017 (1)
O4	0.028 (1)	0.039 (1)	0.025 (1)	−0.002 (1)	−0.003 (1)	−0.018 (1)
O5	0.029 (1)	0.037 (1)	0.022 (1)	−0.011 (1)	−0.005 (1)	−0.014 (1)
O6	0.024 (1)	0.044 (1)	0.024 (1)	−0.010 (1)	−0.005 (1)	−0.020 (1)
O7	0.037 (1)	0.033 (1)	0.026 (1)	−0.017 (1)	−0.003 (1)	−0.010 (1)
O8	0.051 (1)	0.036 (1)	0.049 (1)	0.009 (1)	−0.028 (1)	−0.025 (1)
O9	0.029 (1)	0.024 (1)	0.017 (1)	−0.005 (1)	−0.006 (1)	−0.007 (1)
N1	0.023 (1)	0.027 (1)	0.025 (1)	−0.005 (1)	−0.008 (1)	−0.013 (1)
N2	0.023 (1)	0.034 (1)	0.022 (1)	−0.005 (1)	−0.006 (1)	−0.016 (1)
C1	0.023 (1)	0.027 (1)	0.022 (1)	−0.003 (1)	−0.003 (1)	−0.012 (1)
C2	0.033 (1)	0.032 (1)	0.030 (1)	−0.006 (1)	−0.008 (1)	−0.016 (1)
C3	0.037 (1)	0.029 (1)	0.042 (1)	−0.005 (1)	−0.008 (1)	−0.020 (1)
C4	0.039 (1)	0.025 (1)	0.045 (1)	0.002 (1)	−0.015 (1)	−0.010 (1)
C5	0.032 (1)	0.031 (1)	0.038 (1)	0.000 (1)	−0.016 (1)	−0.012 (1)
C6	0.024 (1)	0.025 (1)	0.026 (1)	−0.002 (1)	−0.007 (1)	−0.011 (1)
C7	0.024 (1)	0.030 (1)	0.027 (1)	−0.001 (1)	−0.012 (1)	−0.012 (1)
C8	0.038 (1)	0.042 (1)	0.059 (2)	0.010 (1)	−0.025 (1)	−0.023 (1)
C9	0.034 (2)	0.057 (2)	0.094 (2)	0.005 (1)	−0.004 (2)	−0.029 (2)
C10	0.033 (1)	0.072 (2)	0.037 (1)	−0.008 (1)	0.004 (1)	−0.010 (1)
C11	0.032 (1)	0.087 (2)	0.060 (2)	−0.003 (1)	−0.007 (1)	−0.033 (2)
C12	0.028 (1)	0.026 (1)	0.021 (1)	−0.002 (1)	−0.006 (1)	−0.012 (1)
C13	0.035 (1)	0.027 (1)	0.026 (1)	−0.004 (1)	−0.012 (1)	−0.012 (1)
C14	0.050 (1)	0.033 (1)	0.025 (1)	−0.005 (1)	−0.014 (1)	−0.014 (1)
C15	0.048 (1)	0.038 (1)	0.019 (1)	−0.010 (1)	−0.005 (1)	−0.011 (1)
C16	0.034 (1)	0.037 (1)	0.023 (1)	−0.009 (1)	−0.004 (1)	−0.013 (1)
C17	0.027 (1)	0.029 (1)	0.021 (1)	−0.003 (1)	−0.007 (1)	−0.012 (1)
C18	0.023 (1)	0.033 (1)	0.023 (1)	−0.006 (1)	−0.004 (1)	−0.013 (1)
C19	0.054 (2)	0.059 (2)	0.029 (1)	−0.036 (1)	−0.005 (1)	−0.008 (1)
C20	0.065 (2)	0.049 (2)	0.045 (2)	−0.035 (1)	−0.023 (1)	−0.001 (1)
C21	0.056 (2)	0.055 (2)	0.052 (2)	0.003 (1)	−0.021 (1)	−0.025 (1)
C22	0.063 (2)	0.078 (2)	0.074 (2)	0.005 (2)	−0.017 (2)	−0.034 (2)

Geometric parameters (Å, º)

Nb1—O1	1.971 (1)	C15—C16	1.395 (3)
Nb1—O3	1.896 (1)	C16—C17	1.416 (3)
Nb1—O4	1.890 (1)	C17—C18	1.470 (3)
Nb1—O6	2.071 (1)	C19—C20	1.512 (3)
Nb1—O9	1.940 (1)	C21—C22	1.465 (4)
Nb1—N1	2.333 (2)	C2—H2	0.95
Nb2—O2	2.061 (1)	C3—H3	0.95
Nb2—O5	1.969 (1)	C4—H4	0.95
Nb2—O7	1.882 (2)	C5—H5	0.95
Nb2—O8	1.897 (2)	C7—H7	0.95
Nb2—O9	1.930 (1)	C8—H8a	0.99
Nb2—N2	2.337 (2)	C8—H8b	0.99
O1—C1	1.357 (2)	C9—H9a	0.98
O2—N1	1.390 (2)	C9—H9b	0.98
O3—C8	1.430 (3)	C9—H9c	0.98
O4—C10	1.423 (3)	C10—H10a	0.99
O5—C12	1.350 (2)	C10—H10b	0.99
O6—N2	1.391 (2)	C11—H11a	0.98
O7—C19	1.409 (3)	C11—H11b	0.98
O8—C21	1.425 (3)	C11—H11c	0.98
N1—C7	1.299 (3)	C13—H13	0.95
N2—C18	1.291 (2)	C14—H14	0.95
C1—C2	1.410 (3)	C15—H15	0.95
C1—C6	1.412 (3)	C16—H16	0.95
C2—C3	1.389 (3)	C18—H18	0.95
C3—C4	1.397 (3)	C19—H19a	0.99
C4—C5	1.390 (3)	C19—H19b	0.99
C5—C6	1.418 (3)	C20—H20a	0.98
C6—C7	1.464 (3)	C20—H20b	0.98
C8—C9	1.495 (4)	C20—H20c	0.98
C10—C11	1.485 (4)	C21—H21a	0.99
C12—C13	1.410 (3)	C21—H21b	0.99
C12—C17	1.416 (3)	C22—H22a	0.98
C13—C14	1.391 (3)	C22—H22b	0.98
C14—C15	1.393 (3)	C22—H22c	0.98
O1—Nb1—O3	98.7 (1)	N2—C18—C17	124.1 (2)
O1—Nb1—O4	93.4 (1)	O7—C19—C20	111.6 (2)
O1—Nb1—O6	93.9 (1)	O8—C21—C22	109.6 (2)
O1—Nb1—O9	155.8 (1)	C3—C2—H2	119.8
O1—Nb1—N1	78.1 (1)	C1—C2—H2	119.8
O3—Nb1—O4	102.2 (1)	C2—C3—H3	119.8
O3—Nb1—O6	86.9 (1)	C4—C3—H3	119.8
O3—Nb1—O9	104.6 (1)	C5—C4—H4	120.1
O3—Nb1—N1	164.7 (1)	C3—C4—H4	120.1
O4—Nb1—O6	167.4 (1)	C4—C5—H5	119.5
O4—Nb1—O9	87.8 (1)	C6—C5—H5	119.5
O4—Nb1—N1	93.0 (1)	N1—C7—H7	117.9
O6—Nb1—O9	81.3 (1)	C6—C7—H7	117.9
O6—Nb1—N1	78.4 (1)	O3—C8—H8a	109.2
O9—Nb1—N1	77.7 (1)	C9—C8—H8a	109.2
O2—Nb2—O5	89.0 (1)	O3—C8—H8b	109.2
O2—Nb2—O7	94.2 (1)	C9—C8—H8b	109.2
O2—Nb2—O8	164.8 (1)	H8a—C8—H8b	107.9
O2—Nb2—O9	81.9 (1)	C8—C9—H9a	109.5
O2—Nb2—N2	77.3 (1)	C8—C9—H9b	109.5
O5—Nb2—O7	99.3 (1)	H9a—C9—H9b	109.5
O5—Nb2—O8	95.3 (1)	C8—C9—H9c	109.5
O5—Nb2—O9	155.5 (1)	H9a—C9—H9c	109.5
O5—Nb2—N2	78.0 (1)	H9b—C9—H9c	109.5
O7—Nb2—O8	99.5 (1)	O4—C10—H10a	108.9
O7—Nb2—O9	104.0 (1)	C11—C10—H10a	108.9
O7—Nb2—N2	171.0 (1)	O4—C10—H10b	108.9
O8—Nb2—O9	88.3 (1)	C11—C10—H10b	108.9
O8—Nb2—N2	89.3 (1)	H10a—C10—H10b	107.7
O9—Nb2—N2	77.9 (1)	C10—C11—H11a	109.5
C1—O1—Nb1	142.9 (1)	C10—C11—H11b	109.5
N1—O2—Nb2	119.2 (1)	H11a—C11—H11b	109.5
C8—O3—Nb1	141.9 (1)	C10—C11—H11c	109.5
C10—O4—Nb1	145.5 (2)	H11a—C11—H11c	109.5
C12—O5—Nb2	143.5 (1)	H11b—C11—H11c	109.5
N2—O6—Nb1	118.5 (1)	C14—C13—H13	119.8
C19—O7—Nb2	153.0 (2)	C12—C13—H13	119.8
C21—O8—Nb2	143.7 (2)	C13—C14—H14	119.7
Nb2—O9—Nb1	129.4 (1)	C15—C14—H14	119.7
C7—N1—O2	113.7 (2)	C16—C15—H15	120.1
C7—N1—Nb1	129.9 (1)	C14—C15—H15	120.1
O2—N1—Nb1	116.1 (1)	C15—C16—H16	119.6
C18—N2—O6	113.7 (2)	C17—C16—H16	119.6
C18—N2—Nb2	130.2 (1)	N2—C18—H18	118.0
O6—N2—Nb2	115.8 (1)	C17—C18—H18	118.0
O1—C1—C2	119.2 (2)	O7—C19—H19a	109.3
O1—C1—C6	121.1 (2)	C20—C19—H19a	109.3
C2—C1—C6	119.7 (2)	O7—C19—H19b	109.3
C3—C2—C1	120.4 (2)	C20—C19—H19b	109.3
C2—C3—C4	120.4 (2)	H19a—C19—H19b	108.0
C5—C4—C3	119.8 (2)	C19—C20—H20a	109.5
C4—C5—C6	121.0 (2)	C19—C20—H20b	109.5
C1—C6—C5	118.6 (2)	H20a—C20—H20b	109.5
C1—C6—C7	123.0 (2)	C19—C20—H20c	109.5
C5—C6—C7	118.4 (2)	H20a—C20—H20c	109.5
N1—C7—C6	124.1 (2)	H20b—C20—H20c	109.5
O3—C8—C9	112.1 (2)	O8—C21—H21a	109.8
O4—C10—C11	113.3 (2)	C22—C21—H21a	109.8
O5—C12—C13	119.1 (2)	O8—C21—H21b	109.8
O5—C12—C17	121.2 (2)	C22—C21—H21b	109.8
C13—C12—C17	119.7 (2)	H21a—C21—H21b	108.2
C14—C13—C12	120.4 (2)	C21—C22—H22a	109.5
C13—C14—C15	120.5 (2)	C21—C22—H22b	109.5
C16—C15—C14	119.9 (2)	H22a—C22—H22b	109.5
C15—C16—C17	120.8 (2)	C21—C22—H22c	109.5
C16—C17—C12	118.7 (2)	H22a—C22—H22c	109.5
C16—C17—C18	118.4 (2)	H22b—C22—H22c	109.5
C12—C17—C18	122.8 (2)
O4—Nb1—O1—C1	−84.3 (2)	O6—Nb1—N1—C7	−94.2 (2)
O3—Nb1—O1—C1	172.8 (2)	O4—Nb1—N1—O2	−92.1 (1)
O9—Nb1—O1—C1	8.0 (3)	O3—Nb1—N1—O2	95.6 (2)
O6—Nb1—O1—C1	85.4 (2)	O9—Nb1—N1—O2	−4.9 (1)
N1—Nb1—O1—C1	8.1 (2)	O1—Nb1—N1—O2	175.1 (1)
O7—Nb2—O2—N1	135.8 (1)	O6—Nb1—N1—O2	78.6 (1)
O8—Nb2—O2—N1	−18.2 (3)	Nb1—O6—N2—C18	151.1 (1)
O9—Nb2—O2—N1	32.2 (1)	Nb1—O6—N2—Nb2	−23.4 (2)
O5—Nb2—O2—N1	−125.0 (1)	O8—Nb2—N2—C18	95.5 (2)
N2—Nb2—O2—N1	−47.1 (1)	O9—Nb2—N2—C18	−176.0 (2)
O4—Nb1—O3—C8	146.3 (2)	O5—Nb2—N2—C18	0.0 (2)
O9—Nb1—O3—C8	55.3 (2)	O2—Nb2—N2—C18	−91.8 (2)
O1—Nb1—O3—C8	−118.3 (2)	O8—Nb2—N2—O6	−91.1 (1)
O6—Nb1—O3—C8	−24.9 (2)	O9—Nb2—N2—O6	−2.7 (1)
N1—Nb1—O3—C8	−41.6 (4)	O5—Nb2—N2—O6	173.3 (1)
O3—Nb1—O4—C10	−121.7 (3)	O2—Nb2—N2—O6	81.6 (1)
O9—Nb1—O4—C10	−17.3 (3)	Nb1—O1—C1—C2	167.8 (2)
O1—Nb1—O4—C10	138.6 (3)	Nb1—O1—C1—C6	−12.1 (3)
O6—Nb1—O4—C10	13.4 (5)	O1—C1—C2—C3	179.1 (2)
N1—Nb1—O4—C10	60.3 (3)	C6—C1—C2—C3	−1.0 (3)
O7—Nb2—O5—C12	170.9 (2)	C1—C2—C3—C4	−1.6 (3)
O8—Nb2—O5—C12	−88.6 (2)	C2—C3—C4—C5	2.0 (3)
O9—Nb2—O5—C12	8.9 (3)	C3—C4—C5—C6	0.3 (3)
O2—Nb2—O5—C12	76.8 (2)	O1—C1—C6—C5	−176.9 (2)
N2—Nb2—O5—C12	−0.4 (2)	C2—C1—C6—C5	3.2 (3)
O4—Nb1—O6—N2	3.8 (3)	O1—C1—C6—C7	4.0 (3)
O3—Nb1—O6—N2	140.2 (1)	C2—C1—C6—C7	−175.9 (2)
O9—Nb1—O6—N2	34.9 (1)	C4—C5—C6—C1	−2.8 (3)
O1—Nb1—O6—N2	−121.2 (1)	C4—C5—C6—C7	176.3 (2)
N1—Nb1—O6—N2	−44.2 (1)	O2—N1—C7—C6	179.8 (2)
O8—Nb2—O7—C19	52.5 (3)	Nb1—N1—C7—C6	−7.3 (3)
O9—Nb2—O7—C19	−38.1 (4)	C1—C6—C7—N1	4.5 (3)
O5—Nb2—O7—C19	149.5 (3)	C5—C6—C7—N1	−174.6 (2)
O2—Nb2—O7—C19	−120.8 (3)	Nb1—O3—C8—C9	97.3 (3)
O7—Nb2—O8—C21	−118.6 (3)	Nb1—O4—C10—C11	−76.9 (4)
O9—Nb2—O8—C21	−14.6 (3)	Nb2—O5—C12—C13	−176.7 (2)
O5—Nb2—O8—C21	141.1 (3)	Nb2—O5—C12—C17	2.8 (3)
O2—Nb2—O8—C21	35.2 (4)	O5—C12—C13—C14	−178.5 (2)
N2—Nb2—O8—C21	63.3 (3)	C17—C12—C13—C14	2.0 (3)
O7—Nb2—O9—Nb1	−136.1 (1)	C12—C13—C14—C15	−0.3 (3)
O8—Nb2—O9—Nb1	124.6 (1)	C13—C14—C15—C16	−1.5 (3)
O5—Nb2—O9—Nb1	25.5 (2)	C14—C15—C16—C17	1.5 (3)
O2—Nb2—O9—Nb1	−43.8 (1)	C15—C16—C17—C12	0.2 (3)
N2—Nb2—O9—Nb1	34.9 (1)	C15—C16—C17—C18	−176.6 (2)
O4—Nb1—O9—Nb2	128.6 (1)	O5—C12—C17—C16	178.5 (2)
O3—Nb1—O9—Nb2	−129.4 (1)	C13—C12—C17—C16	−2.0 (3)
O1—Nb1—O9—Nb2	35.1 (2)	O5—C12—C17—C18	−4.7 (3)
O6—Nb1—O9—Nb2	−44.9 (1)	C13—C12—C17—C18	174.8 (2)
N1—Nb1—O9—Nb2	35.0 (1)	O6—N2—C18—C17	−175.4 (2)
Nb2—O2—N1—C7	154.2 (1)	Nb2—N2—C18—C17	−2.0 (3)
Nb2—O2—N1—Nb1	−19.8 (2)	C16—C17—C18—N2	−178.8 (2)
O4—Nb1—N1—C7	95.2 (2)	C12—C17—C18—N2	4.5 (3)
O3—Nb1—N1—C7	−77.2 (3)	Nb2—O7—C19—C20	−143.7 (3)
O9—Nb1—N1—C7	−177.7 (2)	Nb2—O8—C21—C22	−104.8 (3)
O1—Nb1—N1—C7	2.3 (2)