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 acetonitrile-solvate')
Crystal data
  C6H6F2N4Se	F(000) = 488	
Mr = 251.11	Dx = 1.668 Mg m-3	
Monoclinic, P21/c	Mo Ka radiation, l = 0.71073 Å	
a = 5.0299 (12) Å	Cell parameters from 904 reflections	
b = 16.661 (4) Å	q = 6.0–60.8°	
c = 11.942 (3) Å	m = 3.75 mm-1	
b = 92.667 (5)°	T = 100 K	
V = 999.7 (4)  Å3	Needle, colourless	
Z = 4	0.8 × 0.15 × 0.1 mm	

Data collection
  Bruker AXS Smart CCD 
diffractometer	2465 reflections with I > 2s(I)	
Radiation source: sealed tube	Rint = 0.050	
w scan	qmax = 30.5°, qmin = 2.1°	
Absorption correction: multi-scan 
SADABS2008/1 (Bruker-AXS)	h = -7®7	
Tmin = 0.394, Tmax = 0.746	k = -19®23	
11695 measured reflections	l = -12®17	
3045 independent reflections		

Refinement
  Refinement on F2	0 restraints	
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites	
R[F2 > 2s(F2)] = 0.080	H-atom parameters constrained	
wR(F2) = 0.229	 w = 1/[s2(Fo2) + (0.1429P)2 + 3.4701P]   
where P = (Fo2 + 2Fc2)/3	
S = 1.06	(D/s)max < 0.001	
3045 reflections	Dρmax = 6.69 e Å-3	
130 parameters	Dρmin = -0.80 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	Occ. (<1)	
Se1B	-0.0855 (10)	0.3777 (3)	0.2795 (5)	0.028 (2)	0.087 (3)	
Se1	0.08476 (9)	0.37310 (2)	0.22083 (4)	0.0231 (2)	0.913 (3)	
C1	-0.0786 (9)	0.2893 (3)	0.2993 (4)	0.0306 (9)		
C2	-0.0732 (9)	0.4553 (3)	0.3042 (4)	0.0290 (9)		
C3	0.4433 (9)	0.5574 (3)	0.1144 (4)	0.0274 (9)		
C4	0.6530 (10)	0.6147 (3)	0.0884 (5)	0.0326 (10)		
H4A	0.5952	0.6466	0.0228	0.049*		
H4B	0.8159	0.5854	0.0724	0.049*		
H4C	0.6879	0.6504	0.1527	0.049*		
C5	0.4380 (9)	0.1898 (3)	0.1057 (4)	0.0277 (9)		
C6	0.6477 (10)	0.1325 (3)	0.0795 (5)	0.0314 (10)		
H6A	0.6731	0.0942	0.1414	0.047*		
H6B	0.8143	0.1615	0.0693	0.047*		
H6C	0.5959	0.1035	0.0105	0.047*		
F1	-0.2242 (9)	0.37543 (17)	0.1330 (3)	0.0444 (10)		
F2	0.3340 (7)	0.37091 (18)	0.3357 (3)	0.0406 (8)		
N1	-0.1743 (10)	0.2373 (3)	0.3472 (5)	0.0416 (11)		
N2	-0.1679 (10)	0.5062 (3)	0.3548 (4)	0.0396 (10)		
N3	0.2755 (9)	0.5135 (3)	0.1357 (4)	0.0344 (9)		
N4	0.2714 (9)	0.2341 (3)	0.1271 (4)	0.0365 (10)		

Atomic displacement parameters (Å2)
	U11	U22	U33	U12	U13	U23	
Se1B	0.026 (3)	0.015 (3)	0.042 (4)	-0.0005 (15)	0.002 (2)	0.0007 (17)	
Se1	0.0283 (3)	0.0140 (3)	0.0278 (3)	0.00007 (14)	0.0093 (2)	0.00045 (14)	
C1	0.031 (2)	0.023 (2)	0.038 (2)	0.0021 (16)	0.0082 (18)	0.0004 (17)	
C2	0.030 (2)	0.021 (2)	0.036 (2)	-0.0017 (15)	0.0083 (17)	-0.0017 (17)	
C3	0.028 (2)	0.025 (2)	0.030 (2)	0.0029 (16)	0.0085 (16)	-0.0017 (16)	
C4	0.027 (2)	0.035 (2)	0.036 (2)	-0.0057 (17)	0.0091 (18)	-0.0032 (19)	
C5	0.0273 (19)	0.025 (2)	0.031 (2)	-0.0015 (15)	0.0058 (16)	0.0032 (16)	
C6	0.0233 (19)	0.034 (3)	0.037 (2)	0.0040 (16)	0.0082 (17)	-0.0001 (17)	
F1	0.059 (2)	0.0343 (19)	0.0379 (18)	-0.0003 (13)	-0.0172 (17)	0.0012 (12)	
F2	0.0297 (15)	0.041 (2)	0.051 (2)	-0.0013 (11)	-0.0043 (14)	0.0010 (13)	
N1	0.044 (2)	0.025 (2)	0.057 (3)	0.0022 (18)	0.015 (2)	0.0069 (19)	
N2	0.044 (2)	0.027 (2)	0.050 (3)	-0.0048 (18)	0.015 (2)	-0.0056 (18)	
N3	0.037 (2)	0.025 (2)	0.042 (2)	-0.0013 (16)	0.0111 (18)	0.0020 (16)	
N4	0.040 (2)	0.0239 (19)	0.046 (2)	-0.0009 (16)	0.0092 (19)	-0.0023 (17)	

Geometric parameters (Å, º)
Se1B—Se1	1.134 (6)	Se1—C1	1.891 (5)	
Se1B—C2	1.326 (7)	Se1—N3	2.742 (4)	
Se1B—C1	1.492 (7)	Se1—N4	2.757 (5)	
Se1B—F1	1.854 (6)	C1—N1	1.155 (7)	
Se1B—F2	2.187 (6)	C2—N2	1.156 (7)	
Se1B—N2	2.365 (7)	C3—N3	1.154 (6)	
Se1—F2	1.815 (4)	C3—C4	1.467 (7)	
Se1—F1	1.835 (4)	C5—N4	1.154 (6)	
Se1—C2	1.890 (5)	C5—C6	1.467 (6)	
				
Se1—Se1B—C2	100.1 (4)	Se1B—Se1—N3	117.3 (3)	
Se1—Se1B—C1	91.0 (4)	F2—Se1—N3	93.22 (14)	
C2—Se1B—C1	157.9 (6)	F1—Se1—N3	94.10 (14)	
Se1—Se1B—F1	71.2 (3)	C2—Se1—N3	74.93 (17)	
C2—Se1B—F1	104.0 (4)	C1—Se1—N3	168.97 (18)	
C1—Se1B—F1	97.7 (4)	Se1B—Se1—N4	126.1 (3)	
Se1—Se1B—F2	56.0 (2)	F2—Se1—N4	93.09 (15)	
C2—Se1B—F2	87.0 (3)	F1—Se1—N4	94.64 (15)	
C1—Se1B—F2	83.4 (3)	C2—Se1—N4	169.25 (18)	
F1—Se1B—F2	127.1 (3)	C1—Se1—N4	75.23 (18)	
Se1—Se1B—N2	116.6 (3)	N3—Se1—N4	115.76 (15)	
C2—Se1B—N2	16.5 (3)	N1—C1—Se1B	144.3 (5)	
C1—Se1B—N2	146.8 (4)	N1—C1—Se1	178.7 (4)	
F1—Se1B—N2	108.2 (3)	Se1B—C1—Se1	36.9 (2)	
F2—Se1B—N2	96.6 (2)	N2—C2—Se1B	144.5 (5)	
Se1B—Se1—F2	92.8 (3)	N2—C2—Se1	179.3 (5)	
Se1B—Se1—F1	73.0 (3)	Se1B—C2—Se1	36.2 (3)	
F2—Se1—F1	165.8 (2)	N3—C3—C4	178.7 (5)	
Se1B—Se1—C2	43.7 (3)	N4—C5—C6	179.1 (5)	
F2—Se1—C2	84.77 (19)	Se1—F1—Se1B	35.81 (18)	
F1—Se1—C2	85.42 (19)	Se1—F2—Se1B	31.20 (16)	
Se1B—Se1—C1	52.1 (3)	C2—N2—Se1B	19.0 (3)	
F2—Se1—C1	84.92 (19)	C3—N3—Se1	153.4 (4)	
F1—Se1—C1	85.58 (19)	C5—N4—Se1	153.1 (4)	
C2—Se1—C1	94.1 (2)