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 benzonitrile solvate')
Crystal data
  C16H10F2N4Se	F(000) = 1488	
Mr = 375.24	Dx = 1.501 Mg m-3	
Monoclinic, P21/c	Mo Ka radiation, l = 0.71073 Å	
a = 10.8706 (16) Å	Cell parameters from 997 reflections	
b = 16.630 (3) Å	q = 6.7–59.9°	
c = 18.484 (3) Å	m = 2.28 mm-1	
b = 96.431 (4)°	T = 100 K	
V = 3320.6 (9)  Å3	Prism, colorless	
Z = 8	0.62 × 0.28 × 0.25 mm	

Data collection
  Bruker AXS Smart CCD 
diffractometer	8102 reflections with I > 2s(I)	
Radiation source: sealed tube	Rint = 0.035	
w scan	qmax = 30.1°, qmin = 1.7°	
Absorption correction: multi-scan 
SADABS2008/1 (Bruker AXS)	h = -14®15	
Tmin = 0.501, Tmax = 0.746	k = -23®23	
42419 measured reflections	l = -25®22	
9592 independent reflections		

Refinement
  Refinement on F2	0 restraints	
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites	
R[F2 > 2s(F2)] = 0.045	H-atom parameters constrained	
wR(F2) = 0.113	 w = 1/[s2(Fo2) + (0.0377P)2 + 4.953P]   
where P = (Fo2 + 2Fc2)/3	
S = 1.11	(D/s)max = 0.001	
9592 reflections	Dρmax = 0.87 e Å-3	
435 parameters	Dρmin = -0.67 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)	
Se1A	0.61694 (2)	0.99346 (2)	0.10210 (2)	0.02137 (10)	0.944 (2)	
Se1B	0.12179 (3)	0.48741 (2)	0.15072 (3)	0.02949 (12)	0.906 (2)	
C1A	0.6654 (3)	1.09580 (15)	0.13876 (15)	0.0319 (5)		
C2A	0.5287 (3)	0.96882 (18)	0.18097 (15)	0.0391 (6)		
C3A	0.4931 (2)	0.78682 (15)	0.03640 (14)	0.0297 (5)		
C4A	0.4394 (3)	0.72448 (15)	-0.01101 (14)	0.0311 (5)		
C5A	0.5100 (3)	0.68731 (17)	-0.05880 (16)	0.0410 (6)		
H5A	0.5943	0.7019	-0.0597	0.049*		
C6A	0.4570 (4)	0.6286 (2)	-0.10551 (19)	0.0545 (9)		
H6A	0.5050	0.6024	-0.1384	0.065*		
C7A	0.3336 (4)	0.6081 (2)	-0.1041 (2)	0.0589 (10)		
H7A	0.2967	0.5689	-0.1372	0.071*		
C8A	0.2642 (3)	0.64406 (19)	-0.0551 (2)	0.0516 (9)		
H8A	0.1805	0.6285	-0.0533	0.062*		
C9A	0.3169 (3)	0.70289 (17)	-0.00859 (19)	0.0416 (7)		
H9A	0.2692	0.7284	0.0249	0.050*		
C10A	0.8034 (3)	0.08405 (17)	0.95545 (17)	0.0410 (7)		
C11A	0.8449 (2)	0.11778 (16)	0.89041 (15)	0.0328 (5)		
C12A	0.7630 (3)	0.1605 (2)	0.84174 (19)	0.0459 (7)		
H12A	0.6794	0.1673	0.8509	0.055*		
C13A	0.8037 (3)	0.1929 (2)	0.77986 (19)	0.0520 (8)		
H13A	0.7481	0.2225	0.7466	0.062*		
C14A	0.9246 (3)	0.1824 (2)	0.76636 (18)	0.0457 (7)		
H14A	0.9523	0.2045	0.7237	0.055*		
C15A	1.0050 (3)	0.13990 (17)	0.81452 (17)	0.0374 (6)		
H15A	1.0883	0.1330	0.8047	0.045*		
C16A	0.9674 (2)	0.10704 (16)	0.87677 (16)	0.0328 (5)		
H16A	1.0237	0.0776	0.9098	0.039*		
C1B	0.0730 (4)	0.5906 (2)	0.1162 (2)	0.0564 (9)		
C2B	0.1941 (5)	0.4607 (3)	0.0677 (2)	0.0778 (15)		
C3B	0.2701 (3)	0.29079 (17)	0.21869 (15)	0.0343 (6)		
C4B	0.3287 (3)	0.23035 (16)	0.26658 (15)	0.0350 (6)		
C5B	0.4529 (3)	0.21300 (19)	0.26178 (17)	0.0429 (7)		
H5B	0.4976	0.2408	0.2282	0.051*		
C6B	0.5097 (3)	0.1544 (2)	0.30707 (19)	0.0521 (9)		
H6B	0.5941	0.1414	0.3040	0.063*		
C7B	0.4468 (4)	0.1151 (2)	0.3559 (2)	0.0581 (10)		
H7B	0.4878	0.0756	0.3869	0.070*		
C8B	0.3217 (4)	0.1325 (2)	0.3608 (2)	0.0573 (9)		
H8B	0.2777	0.1047	0.3947	0.069*		
C9B	0.2627 (3)	0.19106 (19)	0.31544 (17)	0.0440 (7)		
H9B	0.1781	0.2037	0.3181	0.053*		
C10B	0.9642 (4)	0.5888 (2)	0.3036 (2)	0.0678 (12)		
C11B	0.9243 (3)	0.62969 (19)	0.36519 (19)	0.0479 (8)		
C12B	0.9993 (3)	0.6873 (2)	0.4043 (2)	0.0562 (10)		
H12B	1.0792	0.6991	0.3909	0.067*		
C13B	0.9566 (3)	0.7263 (2)	0.4617 (2)	0.0586 (10)		
H13B	1.0062	0.7659	0.4881	0.070*		
C14B	0.8424 (3)	0.7079 (2)	0.48072 (18)	0.0485 (7)		
H14B	0.8136	0.7347	0.5210	0.058*		
C15B	0.7675 (3)	0.65155 (17)	0.44321 (17)	0.0385 (6)		
H15B	0.6884	0.6400	0.4579	0.046*		
C16B	0.8065 (3)	0.61208 (17)	0.38481 (18)	0.0402 (6)		
H16B	0.7548	0.5737	0.3582	0.048*		
F1A	0.47407 (16)	1.04425 (11)	0.06541 (9)	0.0439 (4)		
F2A	0.75177 (17)	0.95592 (11)	0.15946 (13)	0.0568 (5)		
F1B	0.2676 (2)	0.53438 (17)	0.18123 (16)	0.0865 (9)		
F2B	-0.0188 (2)	0.45339 (17)	0.0981 (2)	0.1241 (15)		
N1A	0.6948 (3)	1.15920 (15)	0.15973 (15)	0.0450 (6)		
N2A	0.4704 (4)	0.9540 (2)	0.22790 (17)	0.0694 (11)		
N3A	0.5353 (2)	0.83722 (13)	0.07458 (13)	0.0344 (5)		
N4A	0.7697 (3)	0.05720 (18)	1.00720 (16)	0.0558 (8)		
N1B	0.0443 (5)	0.6546 (2)	0.0956 (3)	0.0936 (14)		
N2B	0.2425 (7)	0.4446 (3)	0.0175 (3)	0.167 (3)		
N3B	0.2225 (2)	0.33920 (16)	0.18034 (14)	0.0412 (6)		
N4B	0.9973 (5)	0.5567 (3)	0.2543 (3)	0.1026 (17)		
Se2A	0.6188 (5)	1.0104 (3)	0.1461 (8)	0.047 (4)	0.056 (2)	
Se2B	0.1201 (3)	0.5084 (2)	0.1015 (6)	0.066 (3)	0.094 (2)	

Atomic displacement parameters (Å2)
	U11	U22	U33	U12	U13	U23	
Se1A	0.01989 (12)	0.02128 (13)	0.02361 (18)	-0.00111 (9)	0.00543 (9)	0.00097 (11)	
Se1B	0.02316 (14)	0.02430 (15)	0.0422 (3)	-0.00117 (10)	0.00897 (12)	-0.00830 (14)	
C1A	0.0347 (13)	0.0289 (12)	0.0343 (13)	-0.0029 (10)	0.0136 (11)	0.0001 (10)	
C2A	0.0528 (17)	0.0387 (14)	0.0265 (13)	-0.0193 (12)	0.0082 (12)	-0.0020 (10)	
C3A	0.0319 (13)	0.0260 (11)	0.0323 (13)	-0.0018 (9)	0.0083 (10)	0.0037 (9)	
C4A	0.0371 (14)	0.0243 (11)	0.0309 (12)	-0.0033 (9)	-0.0013 (10)	0.0027 (9)	
C5A	0.0509 (17)	0.0351 (14)	0.0369 (15)	-0.0062 (12)	0.0051 (13)	-0.0038 (11)	
C6A	0.084 (3)	0.0408 (16)	0.0383 (17)	-0.0079 (17)	0.0044 (17)	-0.0104 (13)	
C7A	0.080 (3)	0.0327 (15)	0.059 (2)	-0.0131 (16)	-0.0173 (19)	-0.0056 (14)	
C8A	0.0434 (17)	0.0370 (15)	0.070 (2)	-0.0105 (13)	-0.0120 (16)	-0.0030 (15)	
C9A	0.0337 (14)	0.0333 (13)	0.0565 (18)	-0.0059 (11)	-0.0007 (13)	-0.0004 (12)	
C10A	0.0443 (16)	0.0375 (14)	0.0453 (16)	-0.0164 (12)	0.0228 (13)	-0.0162 (12)	
C11A	0.0309 (13)	0.0307 (12)	0.0391 (14)	-0.0080 (10)	0.0145 (11)	-0.0098 (10)	
C12A	0.0256 (13)	0.061 (2)	0.0516 (19)	0.0004 (12)	0.0072 (12)	-0.0171 (15)	
C13A	0.0443 (18)	0.061 (2)	0.0476 (18)	0.0155 (15)	-0.0066 (14)	0.0031 (15)	
C14A	0.0486 (18)	0.0487 (17)	0.0404 (16)	0.0092 (14)	0.0078 (13)	0.0107 (13)	
C15A	0.0327 (14)	0.0376 (14)	0.0444 (16)	0.0053 (11)	0.0155 (12)	0.0090 (12)	
C16A	0.0316 (13)	0.0299 (12)	0.0385 (14)	0.0034 (10)	0.0110 (11)	0.0058 (10)	
C1B	0.071 (2)	0.0375 (16)	0.064 (2)	0.0101 (16)	0.0213 (19)	-0.0051 (15)	
C2B	0.125 (4)	0.067 (3)	0.045 (2)	0.057 (3)	0.024 (2)	0.0111 (18)	
C3B	0.0329 (14)	0.0373 (13)	0.0342 (14)	0.0014 (10)	0.0101 (11)	-0.0092 (11)	
C4B	0.0382 (14)	0.0333 (13)	0.0329 (13)	0.0048 (10)	0.0018 (11)	-0.0093 (10)	
C5B	0.0418 (16)	0.0470 (16)	0.0395 (16)	0.0133 (13)	0.0027 (13)	-0.0103 (13)	
C6B	0.057 (2)	0.0512 (18)	0.0456 (18)	0.0240 (15)	-0.0076 (15)	-0.0103 (15)	
C7B	0.088 (3)	0.0375 (16)	0.0445 (19)	0.0198 (17)	-0.0117 (18)	-0.0080 (14)	
C8B	0.088 (3)	0.0405 (17)	0.0434 (18)	-0.0061 (17)	0.0081 (18)	0.0001 (14)	
C9B	0.0498 (18)	0.0404 (15)	0.0422 (17)	-0.0019 (13)	0.0063 (14)	-0.0055 (12)	
C10B	0.082 (3)	0.054 (2)	0.075 (3)	0.040 (2)	0.044 (2)	0.0275 (19)	
C11B	0.0530 (19)	0.0413 (15)	0.0536 (19)	0.0256 (14)	0.0251 (15)	0.0228 (14)	
C12B	0.0254 (14)	0.062 (2)	0.081 (3)	0.0045 (14)	0.0061 (15)	0.032 (2)	
C13B	0.0438 (19)	0.065 (2)	0.063 (2)	-0.0086 (16)	-0.0118 (17)	0.0102 (18)	
C14B	0.0519 (19)	0.0535 (18)	0.0393 (16)	0.0035 (15)	0.0018 (14)	0.0029 (14)	
C15B	0.0338 (14)	0.0373 (14)	0.0467 (16)	0.0015 (11)	0.0145 (12)	0.0076 (12)	
C16B	0.0470 (17)	0.0283 (12)	0.0475 (17)	0.0052 (11)	0.0147 (13)	0.0067 (11)	
F1A	0.0398 (9)	0.0507 (10)	0.0386 (9)	0.0141 (8)	-0.0070 (7)	-0.0014 (8)	
F2A	0.0368 (10)	0.0413 (10)	0.0869 (15)	0.0133 (8)	-0.0169 (10)	-0.0044 (10)	
F1B	0.0735 (16)	0.0809 (17)	0.096 (2)	-0.0444 (14)	-0.0324 (14)	0.0085 (15)	
F2B	0.0552 (15)	0.0636 (16)	0.236 (4)	-0.0217 (12)	-0.062 (2)	0.003 (2)	
N1A	0.0593 (17)	0.0318 (12)	0.0476 (15)	-0.0095 (11)	0.0215 (13)	-0.0052 (10)	
N2A	0.104 (3)	0.066 (2)	0.0436 (16)	-0.0475 (19)	0.0336 (18)	-0.0164 (14)	
N3A	0.0392 (12)	0.0278 (10)	0.0380 (12)	-0.0061 (9)	0.0117 (10)	0.0001 (9)	
N4A	0.073 (2)	0.0489 (15)	0.0524 (17)	-0.0282 (14)	0.0383 (15)	-0.0186 (13)	
N1B	0.140 (4)	0.0447 (18)	0.102 (3)	0.032 (2)	0.042 (3)	0.002 (2)	
N2B	0.314 (9)	0.132 (4)	0.070 (3)	0.155 (5)	0.090 (4)	0.044 (3)	
N3B	0.0431 (14)	0.0413 (13)	0.0401 (13)	0.0090 (11)	0.0084 (11)	-0.0047 (10)	
N4B	0.146 (4)	0.075 (3)	0.102 (3)	0.066 (3)	0.081 (3)	0.029 (2)	
Se2A	0.028 (3)	0.010 (2)	0.110 (10)	0.0037 (15)	0.034 (4)	0.003 (3)	
Se2B	0.0326 (19)	0.0285 (18)	0.132 (8)	0.0014 (13)	-0.010 (2)	-0.019 (3)	

Geometric parameters (Å, º)
Se1A—Se2A	0.859 (13)	C15A—C16A	1.377 (4)	
Se1A—F2A	1.8204 (18)	C15A—H15A	0.9500	
Se1A—F1A	1.8302 (16)	C16A—H16A	0.9500	
Se1A—C2A	1.878 (3)	C1B—N1B	1.162 (5)	
Se1A—C1A	1.885 (3)	C1B—Se2B	1.495 (5)	
Se1B—Se2B	0.972 (10)	C2B—N2B	1.149 (5)	
Se1B—F1B	1.800 (2)	C2B—Se2B	1.335 (7)	
Se1B—F2B	1.808 (2)	C3B—N3B	1.156 (4)	
Se1B—C2B	1.854 (4)	C3B—C4B	1.440 (4)	
Se1B—C1B	1.886 (4)	C4B—C9B	1.379 (4)	
C1A—N1A	1.156 (4)	C4B—C5B	1.394 (4)	
C1A—Se2A	1.519 (5)	C5B—C6B	1.384 (4)	
C2A—N2A	1.157 (4)	C5B—H5B	0.9500	
C2A—Se2A	1.412 (7)	C6B—C7B	1.359 (6)	
C3A—N3A	1.157 (3)	C6B—H6B	0.9500	
C3A—C4A	1.438 (3)	C7B—C8B	1.403 (6)	
C4A—C5A	1.379 (4)	C7B—H7B	0.9500	
C4A—C9A	1.385 (4)	C8B—C9B	1.394 (5)	
C5A—C6A	1.386 (4)	C8B—H8B	0.9500	
C5A—H5A	0.9500	C9B—H9B	0.9500	
C6A—C7A	1.386 (6)	C10B—N4B	1.148 (5)	
C6A—H6A	0.9500	C10B—C11B	1.434 (5)	
C7A—C8A	1.379 (6)	C11B—C16B	1.400 (5)	
C7A—H7A	0.9500	C11B—C12B	1.405 (5)	
C8A—C9A	1.384 (4)	C12B—C13B	1.369 (6)	
C8A—H8A	0.9500	C12B—H12B	0.9500	
C9A—H9A	0.9500	C13B—C14B	1.363 (5)	
C10A—N4A	1.152 (4)	C13B—H13B	0.9500	
C10A—C11A	1.444 (4)	C14B—C15B	1.376 (5)	
C11A—C12A	1.388 (4)	C14B—H14B	0.9500	
C11A—C16A	1.394 (4)	C15B—C16B	1.371 (4)	
C12A—C13A	1.381 (5)	C15B—H15B	0.9500	
C12A—H12A	0.9500	C16B—H16B	0.9500	
C13A—C14A	1.376 (5)	F1A—Se2A	2.119 (11)	
C13A—H13A	0.9500	F2A—Se2A	1.700 (5)	
C14A—C15A	1.372 (4)	F1B—Se2B	2.097 (6)	
C14A—H14A	0.9500	F2B—Se2B	1.761 (5)	
				
Se2A—Se1A—F2A	68.2 (4)	Se2B—C1B—Se1B	30.8 (4)	
Se2A—Se1A—F1A	97.4 (4)	N2B—C2B—Se2B	150.6 (6)	
F2A—Se1A—F1A	165.59 (9)	N2B—C2B—Se1B	177.9 (7)	
Se2A—Se1A—C2A	45.3 (3)	Se2B—C2B—Se1B	30.3 (4)	
F2A—Se1A—C2A	85.47 (13)	N3B—C3B—C4B	179.6 (3)	
F1A—Se1A—C2A	84.39 (12)	C9B—C4B—C5B	121.5 (3)	
Se2A—Se1A—C1A	52.2 (3)	C9B—C4B—C3B	120.4 (3)	
F2A—Se1A—C1A	85.75 (11)	C5B—C4B—C3B	118.0 (3)	
F1A—Se1A—C1A	84.71 (11)	C6B—C5B—C4B	118.5 (3)	
C2A—Se1A—C1A	93.69 (12)	C6B—C5B—H5B	120.8	
Se2B—Se1B—F1B	93.5 (2)	C4B—C5B—H5B	120.8	
Se2B—Se1B—F2B	71.5 (3)	C7B—C6B—C5B	121.1 (3)	
F1B—Se1B—F2B	165.01 (16)	C7B—C6B—H6B	119.5	
Se2B—Se1B—C2B	43.8 (3)	C5B—C6B—H6B	119.5	
F1B—Se1B—C2B	85.6 (2)	C6B—C7B—C8B	120.5 (3)	
F2B—Se1B—C2B	83.8 (2)	C6B—C7B—H7B	119.7	
Se2B—Se1B—C1B	51.8 (3)	C8B—C7B—H7B	119.7	
F1B—Se1B—C1B	85.15 (16)	C9B—C8B—C7B	119.2 (3)	
F2B—Se1B—C1B	85.08 (16)	C9B—C8B—H8B	120.4	
C2B—Se1B—C1B	93.89 (17)	C7B—C8B—H8B	120.4	
N1A—C1A—Se2A	154.9 (6)	C4B—C9B—C8B	119.2 (3)	
N1A—C1A—Se1A	178.5 (3)	C4B—C9B—H9B	120.4	
Se2A—C1A—Se1A	26.5 (5)	C8B—C9B—H9B	120.4	
N2A—C2A—Se2A	155.9 (6)	N4B—C10B—C11B	179.2 (6)	
N2A—C2A—Se1A	177.5 (3)	C16B—C11B—C12B	120.3 (3)	
Se2A—C2A—Se1A	25.6 (5)	C16B—C11B—C10B	118.2 (4)	
N3A—C3A—C4A	179.4 (3)	C12B—C11B—C10B	121.5 (4)	
C5A—C4A—C9A	120.7 (3)	C13B—C12B—C11B	119.6 (3)	
C5A—C4A—C3A	119.8 (3)	C13B—C12B—H12B	120.2	
C9A—C4A—C3A	119.5 (3)	C11B—C12B—H12B	120.2	
C4A—C5A—C6A	119.5 (3)	C14B—C13B—C12B	119.4 (4)	
C4A—C5A—H5A	120.3	C14B—C13B—H13B	120.3	
C6A—C5A—H5A	120.3	C12B—C13B—H13B	120.3	
C5A—C6A—C7A	119.8 (3)	C13B—C14B—C15B	121.8 (3)	
C5A—C6A—H6A	120.1	C13B—C14B—H14B	119.1	
C7A—C6A—H6A	120.1	C15B—C14B—H14B	119.1	
C8A—C7A—C6A	120.5 (3)	C16B—C15B—C14B	120.3 (3)	
C8A—C7A—H7A	119.8	C16B—C15B—H15B	119.8	
C6A—C7A—H7A	119.8	C14B—C15B—H15B	119.8	
C7A—C8A—C9A	119.7 (3)	C15B—C16B—C11B	118.4 (3)	
C7A—C8A—H8A	120.1	C15B—C16B—H16B	120.8	
C9A—C8A—H8A	120.1	C11B—C16B—H16B	120.8	
C8A—C9A—C4A	119.7 (3)	Se1A—F1A—Se2A	23.7 (3)	
C8A—C9A—H9A	120.1	Se2A—F2A—Se1A	28.0 (5)	
C4A—C9A—H9A	120.1	Se1B—F1B—Se2B	27.6 (2)	
N4A—C10A—C11A	179.6 (4)	Se2B—F2B—Se1B	31.6 (3)	
C12A—C11A—C16A	120.3 (3)	Se1A—Se2A—C2A	109.1 (7)	
C12A—C11A—C10A	120.1 (3)	Se1A—Se2A—C1A	101.2 (7)	
C16A—C11A—C10A	119.6 (3)	C2A—Se2A—C1A	138.9 (6)	
C13A—C12A—C11A	119.7 (3)	Se1A—Se2A—F2A	83.8 (4)	
C13A—C12A—H12A	120.2	C2A—Se2A—F2A	107.1 (4)	
C11A—C12A—H12A	120.2	C1A—Se2A—F2A	103.0 (3)	
C14A—C13A—C12A	120.1 (3)	Se1A—Se2A—F1A	58.9 (6)	
C14A—C13A—H13A	120.0	C2A—Se2A—F1A	87.3 (4)	
C12A—C13A—H13A	120.0	C1A—Se2A—F1A	85.3 (4)	
C15A—C14A—C13A	120.0 (3)	F2A—Se2A—F1A	142.7 (7)	
C15A—C14A—H14A	120.0	Se1B—Se2B—C2B	105.9 (4)	
C13A—C14A—H14A	120.0	Se1B—Se2B—C1B	97.4 (6)	
C14A—C15A—C16A	121.3 (3)	C2B—Se2B—C1B	150.0 (7)	
C14A—C15A—H15A	119.3	Se1B—Se2B—F2B	76.9 (4)	
C16A—C15A—H15A	119.3	C2B—Se2B—F2B	103.5 (4)	
C15A—C16A—C11A	118.6 (3)	C1B—Se2B—F2B	99.9 (3)	
C15A—C16A—H16A	120.7	Se1B—Se2B—F1B	58.9 (3)	
C11A—C16A—H16A	120.7	C2B—Se2B—F1B	89.9 (3)	
N1B—C1B—Se2B	149.6 (6)	C1B—Se2B—F1B	86.2 (3)	
N1B—C1B—Se1B	179.1 (5)	F2B—Se2B—F1B	135.8 (6)