Abstract
 
Computing details
Data collection: Smart (Bruker AXS); cell refinement: Saint (Bruker AXS); data reduction: Saint (Bruker AXS); program(s) used to solve structure: SHELXS2013 (Sheldrick, 2013); program(s) used to refine structure: SHELXL2013 (Sheldrick, 2013); molecular graphics: ORTEP-3.2 for Windows; software used to prepare material for publication: publCIF (IUCR).
References
NOT FOUND
('selenium dicyanide difluoride tetrahydrofurane-solvate')
Crystal data
  C10H0F2N2O2Se	Dx = 1.464 Mg m-3	
Mr = 297.08	Mo Ka radiation, l = 0.71073 Å	
Orthorhombic, Pnma	Cell parameters from 418 reflections	
a = 13.717 (18) Å	q = 8.0–57.8°	
b = 20.45 (4) Å	m = 2.80 mm-1	
c = 4.804 (5) Å	T = 133 K	
V = 1348 (3)  Å3	Prism, colourless	
Z = 4	0.7 × 0.21 × 0.19 mm	
F(000) = 568		

Data collection
  Bruker AXS Smart CCD 
diffractometer	Rint = 0.108	
Radiation source: sealed tube	qmax = 30.5°, qmin = 2.0°	
w scan	h = -12®9	
1299 measured reflections	k = -3®27	
906 independent reflections	l = 0®6	
545 reflections with I > 2s(I)		

Refinement
  Refinement on F2	0 restraints	
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites	
R[F2 > 2s(F2)] = 0.085	H-atom parameters constrained	
wR(F2) = 0.218	 w = 1/[s2(Fo2) + (0.1558P)2]   
where P = (Fo2 + 2Fc2)/3	
S = 0.93	(D/s)max < 0.001	
906 reflections	Dñmax = 0.74 e Å-3	
82 parameters	Dñmin = -1.96 e Å-3	

Special details
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)
	x	y	z	Uiso*/Ueq	
Se1	0.48990 (9)	0.2500	0.5004 (3)	0.0240 (5)	
F1	0.3895 (6)	0.2500	0.2521 (18)	0.047 (2)	
F2	0.5692 (5)	0.2500	0.8048 (19)	0.046 (2)	
N1	0.3801 (7)	0.1397 (3)	0.778 (2)	0.053 (3)	
C1	0.4206 (7)	0.1827 (3)	0.680 (2)	0.034 (2)	
O1	0.5756 (5)	0.1417 (2)	0.3605 (16)	0.0380 (17)	
C2	0.6775 (8)	0.1478 (3)	0.277 (2)	0.044 (3)	
H2A	0.7153	0.1684	0.4239	0.053*	
H2B	0.6831	0.1741	0.1098	0.053*	
C3	0.5403 (8)	0.0795 (3)	0.285 (2)	0.045 (3)	
H3A	0.4833	0.0837	0.1669	0.054*	
H3B	0.5224	0.0548	0.4499	0.054*	
C4	0.7124 (8)	0.0805 (4)	0.226 (3)	0.058 (3)	
H4A	0.7620	0.0796	0.0821	0.070*	
H4B	0.7385	0.0610	0.3944	0.070*	
C5	0.6209 (8)	0.0460 (4)	0.133 (3)	0.060 (3)	
H5A	0.6234	-0.0001	0.1807	0.072*	
H5B	0.6123	0.0501	-0.0669	0.072*	

Atomic displacement parameters (Å2)
	U11	U22	U33	U12	U13	U23	
Se1	0.0272 (13)	0.0282 (6)	0.0165 (7)	0.000	0.0013 (5)	0.000	
F1	0.032 (6)	0.099 (5)	0.011 (6)	0.000	0.001 (3)	0.000	
F2	0.034 (6)	0.062 (4)	0.044 (7)	0.000	-0.016 (4)	0.000	
N1	0.071 (8)	0.043 (4)	0.045 (8)	-0.017 (4)	0.025 (5)	0.004 (3)	
C1	0.034 (7)	0.032 (4)	0.035 (7)	0.004 (3)	0.004 (4)	-0.003 (3)	
O1	0.039 (5)	0.028 (3)	0.046 (6)	-0.003 (3)	0.009 (3)	-0.008 (2)	
C2	0.039 (9)	0.042 (4)	0.050 (8)	-0.009 (4)	0.006 (5)	-0.002 (4)	
C3	0.047 (8)	0.032 (4)	0.056 (9)	-0.002 (4)	-0.003 (5)	-0.011 (3)	
C4	0.047 (9)	0.053 (5)	0.074 (12)	-0.002 (5)	-0.001 (5)	-0.011 (5)	
C5	0.076 (11)	0.054 (6)	0.050 (11)	0.000 (5)	0.009 (6)	-0.020 (5)	

Geometric parameters (Å, º)
Se1—F1	1.822 (8)	C2—H2B	0.9700	
Se1—F2	1.822 (8)	C3—C5	1.494 (14)	
Se1—C1i	1.882 (8)	C3—H3A	0.9700	
Se1—C1	1.882 (8)	C3—H3B	0.9700	
Se1—O1	2.595 (6)	C4—C5	1.508 (14)	
N1—C1	1.140 (10)	C4—H4A	0.9700	
O1—C3	1.409 (9)	C4—H4B	0.9700	
O1—C2	1.459 (11)	C5—H5A	0.9700	
C2—C4	1.479 (12)	C5—H5B	0.9700	
C2—H2A	0.9700			
				
F1—Se1—F2	167.5 (4)	H2A—C2—H2B	108.7	
F1—Se1—C1i	85.3 (4)	O1—C3—C5	106.6 (9)	
F2—Se1—C1i	86.2 (4)	O1—C3—H3A	110.4	
F1—Se1—C1	85.3 (4)	C5—C3—H3A	110.4	
F2—Se1—C1	86.2 (4)	O1—C3—H3B	110.4	
C1i—Se1—C1	94.0 (5)	C5—C3—H3B	110.4	
F1—Se1—O1	100.0 (2)	H3A—C3—H3B	108.6	
F2—Se1—O1	86.4 (2)	C5—C4—C2	102.5 (9)	
C1i—Se1—O1	166.3 (3)	C5—C4—H4A	111.3	
C1—Se1—O1	74.0 (3)	C2—C4—H4A	111.3	
N1—C1—Se1	176.4 (8)	C5—C4—H4B	111.3	
C3—O1—C2	109.7 (6)	C2—C4—H4B	111.3	
C3—O1—Se1	132.9 (6)	H4A—C4—H4B	109.2	
C2—O1—Se1	115.6 (4)	C4—C5—C3	104.8 (8)	
O1—C2—C4	106.0 (7)	C4—C5—H5A	110.8	
O1—C2—H2A	110.5	C3—C5—H5A	110.8	
C4—C2—H2A	110.5	C4—C5—H5B	110.8	
O1—C2—H2B	110.5	C3—C5—H5B	110.8	
C4—C2—H2B	110.5	H5A—C5—H5B	108.9	
				
C3—O1—C2—C4	-17.0 (11)	O1—C2—C4—C5	29.7 (12)	
Se1—O1—C2—C4	176.3 (7)	C2—C4—C5—C3	-31.6 (13)	
C2—O1—C3—C5	-3.5 (12)	O1—C3—C5—C4	22.1 (13)	
Se1—O1—C3—C5	160.1 (7)			

Symmetry code:  (i) x, -y+1/2, z.