Crystal structure of bis­(aceto­nitrile-κN)(4,4′-di-tert-butyl-2,2′-bi­pyridine-κ2N,N′)platinum(II) bis­(tetra­fluorido­borate) packing as head-to-head dimers

Joseph, C.; Nesterov, V.N.; Smucker, B.W.

doi:10.1107/S2056989018005923

Crystal structure of bis(acetonitrile-κN)(4,4′-di-tert-butyl-2,2′-bipyridine-κ²N,N′)platinum(II) bis(tetrafluoridoborate) packing as head-to-head dimers

C. Joseph, V. N. Nesterov and B. W. Smucker

The bulky tert-butyl groups of the dbbpy ligand do not preclude the formation of head-to-head dimers in the crystal structure of bis(acetonitrile)(4,4′-di-tert-butyl-2,2′-bipyridine)platinum(II) tetrafluoridoborate.

Keywords: supramolecular; platinum(II); crystal structure.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S2056989018005923/jj2198sup1.cif Contains datablock I
	Structure factor file (CIF format) https://doi.org/10.1107/S2056989018005923/jj2198Isup2.hkl Contains datablock I
	MDL mol file https://doi.org/10.1107/S2056989018005923/jj2198Isup3.mol Supplementary material

CCDC reference: 1837532

checkCIF report

Key indicators

Single-crystal X-ray study
T = 100 K
Mean (C-C) = 0.007 Å
R factor = 0.033
wR factor = 0.113
Data-to-parameter ratio = 17.3

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT906_ALERT_3_C Large K Value in the Analysis of Variance ......      5.097 Check
PLAT972_ALERT_2_C Check Calcd Resid. Dens.  0.88A   From C12            -1.59 eA-3
PLAT974_ALERT_2_C Check Calcd Negative Resid. Density on       Pt1      -1.46 eA-3

Alert level G
PLAT005_ALERT_5_G No Embedded Refinement Details Found  in the CIF     Please Do !
PLAT244_ALERT_4_G Low    'Solvent' Ueq as Compared to Neighbors of         B1 Check
PLAT244_ALERT_4_G Low    'Solvent' Ueq as Compared to Neighbors of         B2 Check
PLAT432_ALERT_2_G Short Inter X...Y Contact  F2       ..C21              2.92 Ang.
PLAT432_ALERT_2_G Short Inter X...Y Contact  F7       ..C5               2.91 Ang.
PLAT794_ALERT_5_G Tentative Bond Valency for Pt1       (II)      .       2.42 Info
PLAT899_ALERT_4_G SHELXL97   is Deprecated and Succeeded by SHELXL       2018 Note
PLAT912_ALERT_4_G Missing # of FCF Reflections Above STh/L=  0.600          2 Note
PLAT978_ALERT_2_G Number C-C Bonds with Positive Residual Density.          2 Info

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

   0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   5 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
   4 ALERT type 4 Improvement, methodology, query or suggestion
   2 ALERT type 5 Informative message, check

Computing details top

Data collection: APEX2 (Bruker, 2007); cell refinement: APEX2 (Bruker, 2007); data reduction: APEX2 (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and Mercury (Macrae et al., 2006).

Bis(acetonitrile-κN)(4,4'-di-tert-butyl-2,2'-bipyridine-κ²N,N')platinum(II) bis(tetrafluoridoborate) top

Crystal data top

[Pt(C₁₈H₂₄N₂)(C₂H₃N)₂](BF₄)₂	F(000) = 2800
M_r = 719.21	D_x = 1.785 Mg m⁻³
Orthorhombic, Pbcn	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2n 2ab	Cell parameters from 9946 reflections
a = 16.3409 (10) Å	θ = 2.2–27.1°
b = 13.0447 (8) Å	µ = 5.32 mm⁻¹
c = 25.1105 (16) Å	T = 100 K
V = 5352.6 (6) Å³	Plate, yellow
Z = 8	0.14 × 0.14 × 0.08 mm

Data collection top

Bruker APEXII CCD diffractometer	5919 independent reflections
Radiation source: fine-focus sealed tube	4823 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.048
ω scans	θ_max = 27.1°, θ_min = 1.6°
Absorption correction: multi-scan (SADABS; Bruker, 2001)	h = −20→20
T_min = 0.515, T_max = 0.682	k = −16→16
61655 measured reflections	l = −32→32

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.033	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.113	H-atom parameters constrained
S = 1.01	w = 1/[σ²(F_o²) + (0.080P)² + 5.P] where P = (F_o² + 2F_c²)/3
5919 reflections	(Δ/σ)_max = 0.001
342 parameters	Δρ_max = 1.39 e Å⁻³
0 restraints	Δρ_min = −1.55 e Å⁻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.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > 2sigma(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
Pt1	0.098683 (11)	0.487050 (15)	0.187162 (8)	0.02001 (9)
N1	0.1092 (2)	0.3711 (3)	0.23845 (16)	0.0200 (8)
C1	0.1088 (3)	0.3805 (4)	0.29169 (19)	0.0230 (10)
H1A	0.1042	0.4469	0.3070	0.028*
N2	0.1029 (2)	0.3703 (3)	0.13593 (17)	0.0227 (9)
C2	0.1149 (3)	0.2965 (4)	0.3246 (2)	0.0261 (11)
H2A	0.1140	0.3054	0.3622	0.031*
N3	0.1005 (2)	0.5974 (3)	0.24244 (18)	0.0247 (9)
C3	0.1223 (3)	0.1981 (4)	0.30320 (17)	0.0188 (9)
N4	0.0870 (2)	0.5961 (3)	0.13214 (18)	0.0261 (9)
C4	0.1233 (3)	0.1908 (3)	0.24737 (17)	0.0203 (9)
H4A	0.1280	0.1254	0.2310	0.024*
C5	0.1174 (3)	0.2771 (4)	0.21635 (17)	0.0197 (9)
C6	0.1182 (3)	0.2775 (4)	0.15764 (18)	0.0214 (10)
C7	0.1341 (3)	0.1931 (3)	0.12624 (17)	0.0197 (9)
H7A	0.1449	0.1288	0.1425	0.024*
C8	0.1346 (3)	0.2010 (4)	0.07074 (18)	0.0235 (10)
C9	0.1159 (3)	0.2968 (4)	0.0501 (2)	0.0282 (11)
H9A	0.1142	0.3057	0.0125	0.034*
C10	0.0999 (3)	0.3787 (4)	0.08242 (19)	0.0281 (12)
H10A	0.0864	0.4429	0.0669	0.034*
C11	0.1265 (3)	0.1023 (4)	0.33750 (18)	0.0224 (10)
C12	0.2078 (3)	0.0461 (4)	0.32623 (19)	0.0261 (10)
H12A	0.2115	0.0299	0.2882	0.039*
H12B	0.2099	−0.0174	0.3470	0.039*
H12C	0.2538	0.0903	0.3364	0.039*
C13	0.0557 (3)	0.0306 (4)	0.3229 (2)	0.0274 (11)
H13A	0.0624	0.0069	0.2861	0.041*
H13B	0.0038	0.0675	0.3263	0.041*
H13C	0.0557	−0.0285	0.3470	0.041*
C14	0.1207 (3)	0.1287 (4)	0.39695 (19)	0.0315 (12)
H14A	0.0716	0.1698	0.4034	0.047*
H14B	0.1693	0.1677	0.4076	0.047*
H14C	0.1177	0.0653	0.4178	0.047*
C15	0.1569 (3)	0.1088 (4)	0.03663 (18)	0.0249 (10)
C16	0.0911 (4)	0.0262 (4)	0.0438 (2)	0.0344 (13)
H16A	0.0875	0.0072	0.0815	0.052*
H16B	0.1057	−0.0344	0.0227	0.052*
H16C	0.0382	0.0528	0.0317	0.052*
C17	0.2397 (3)	0.0657 (5)	0.0539 (2)	0.0389 (13)
H17A	0.2383	0.0504	0.0921	0.058*
H17B	0.2826	0.1163	0.0468	0.058*
H17C	0.2512	0.0027	0.0340	0.058*
C18	0.1638 (4)	0.1369 (4)	−0.02260 (19)	0.0379 (14)
H18A	0.1101	0.1584	−0.0359	0.057*
H18B	0.1826	0.0771	−0.0428	0.057*
H18C	0.2029	0.1932	−0.0269	0.057*
C19	0.1018 (3)	0.6625 (4)	0.2714 (2)	0.0249 (11)
C20	0.1019 (3)	0.7449 (5)	0.3107 (2)	0.0320 (13)
H20A	0.1448	0.7945	0.3019	0.048*
H20B	0.1124	0.7162	0.3461	0.048*
H20C	0.0486	0.7793	0.3106	0.048*
C21	0.0799 (3)	0.6560 (4)	0.1006 (2)	0.0282 (11)
C22	0.0702 (4)	0.7321 (4)	0.0583 (2)	0.0435 (15)
H22B	0.0863	0.7018	0.0241	0.065*
H22C	0.1049	0.7916	0.0659	0.065*
H22A	0.0129	0.7538	0.0565	0.065*
F5	0.3387 (3)	0.4742 (3)	0.18538 (12)	0.0439 (9)
F1	0.0964 (2)	0.5412 (3)	0.37735 (13)	0.0444 (9)
F6	0.4162 (2)	0.3323 (3)	0.18232 (14)	0.0466 (9)
F7	0.2907 (2)	0.3270 (3)	0.22056 (14)	0.0499 (9)
F8	0.3013 (2)	0.3445 (3)	0.13080 (14)	0.0481 (9)
F2	0.0499 (2)	0.5587 (3)	0.46122 (13)	0.0498 (9)
F3	0.1841 (2)	0.5745 (3)	0.44502 (13)	0.0519 (10)
F4	0.1237 (3)	0.4179 (3)	0.43888 (16)	0.0742 (14)
B1	0.1145 (5)	0.5186 (6)	0.4330 (2)	0.0345 (16)
B2	0.3361 (4)	0.3695 (5)	0.1792 (2)	0.0293 (13)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Pt1	0.02479 (13)	0.01503 (13)	0.02021 (13)	−0.00068 (6)	−0.00068 (7)	0.00112 (6)
N1	0.025 (2)	0.018 (2)	0.018 (2)	−0.0017 (15)	−0.0023 (15)	−0.0012 (15)
C1	0.034 (3)	0.018 (2)	0.017 (2)	−0.0026 (19)	−0.0004 (19)	−0.0040 (19)
N2	0.031 (2)	0.016 (2)	0.022 (2)	−0.0061 (15)	−0.0026 (16)	0.0006 (16)
C2	0.037 (3)	0.023 (3)	0.019 (2)	−0.001 (2)	−0.003 (2)	−0.002 (2)
N3	0.026 (2)	0.021 (2)	0.028 (2)	0.0024 (15)	−0.0013 (16)	0.0027 (18)
C3	0.021 (2)	0.018 (2)	0.018 (2)	−0.0039 (18)	0.0009 (18)	0.0024 (17)
N4	0.030 (2)	0.018 (2)	0.031 (2)	0.0031 (16)	−0.0006 (17)	−0.0011 (18)
C4	0.023 (2)	0.022 (2)	0.016 (2)	−0.0032 (18)	−0.0004 (18)	−0.0033 (18)
C5	0.022 (2)	0.019 (2)	0.018 (2)	−0.0040 (17)	0.0009 (18)	−0.0023 (17)
C6	0.022 (2)	0.022 (2)	0.020 (2)	−0.0055 (18)	−0.0032 (18)	0.0021 (18)
C7	0.023 (2)	0.017 (2)	0.019 (2)	−0.0040 (18)	−0.0039 (18)	0.0020 (17)
C8	0.030 (3)	0.020 (2)	0.021 (2)	−0.0075 (19)	−0.002 (2)	0.0024 (18)
C9	0.044 (3)	0.027 (3)	0.013 (2)	−0.003 (2)	−0.003 (2)	0.0052 (19)
C10	0.043 (3)	0.023 (3)	0.018 (3)	−0.005 (2)	−0.008 (2)	0.0033 (19)
C11	0.029 (2)	0.022 (2)	0.017 (2)	0.002 (2)	−0.0029 (19)	0.0013 (18)
C12	0.029 (3)	0.024 (2)	0.026 (2)	0.007 (2)	0.003 (2)	0.009 (2)
C13	0.031 (3)	0.022 (2)	0.029 (3)	−0.006 (2)	0.001 (2)	0.007 (2)
C14	0.046 (3)	0.027 (3)	0.021 (3)	0.000 (2)	0.000 (2)	0.009 (2)
C15	0.034 (3)	0.025 (2)	0.016 (2)	−0.003 (2)	−0.0014 (19)	−0.0013 (19)
C16	0.049 (4)	0.024 (3)	0.030 (3)	0.001 (2)	−0.003 (2)	−0.007 (2)
C17	0.037 (3)	0.051 (4)	0.028 (3)	0.006 (3)	0.006 (2)	0.006 (3)
C18	0.066 (4)	0.035 (3)	0.013 (2)	0.006 (3)	−0.002 (2)	−0.003 (2)
C19	0.029 (3)	0.023 (3)	0.023 (3)	0.0030 (19)	0.002 (2)	−0.002 (2)
C20	0.041 (3)	0.022 (3)	0.032 (3)	0.001 (2)	0.000 (2)	−0.006 (2)
C21	0.032 (3)	0.023 (3)	0.029 (3)	0.008 (2)	0.005 (2)	0.005 (2)
C22	0.057 (4)	0.032 (3)	0.041 (4)	0.009 (3)	−0.006 (3)	0.022 (3)
F5	0.056 (2)	0.033 (2)	0.042 (2)	0.0095 (17)	0.0005 (15)	0.0018 (15)
F1	0.054 (2)	0.052 (2)	0.0273 (18)	0.0104 (16)	−0.0050 (14)	−0.0065 (17)
F6	0.0295 (17)	0.041 (2)	0.070 (3)	0.0038 (15)	0.0019 (15)	−0.0015 (17)
F7	0.0379 (19)	0.060 (2)	0.052 (2)	−0.0054 (16)	0.0043 (16)	0.0274 (19)
F8	0.049 (2)	0.049 (2)	0.046 (2)	−0.0100 (17)	−0.0084 (16)	−0.0111 (16)
F2	0.051 (2)	0.064 (3)	0.0348 (19)	−0.0122 (19)	0.0087 (16)	−0.0163 (17)
F3	0.046 (2)	0.074 (3)	0.0358 (19)	−0.0100 (19)	0.0048 (15)	−0.0153 (18)
F4	0.132 (4)	0.035 (2)	0.056 (3)	0.012 (2)	−0.024 (3)	−0.004 (2)
B1	0.035 (3)	0.046 (4)	0.023 (3)	0.014 (3)	−0.009 (3)	−0.026 (3)
B2	0.023 (3)	0.022 (3)	0.043 (4)	−0.005 (2)	0.003 (2)	0.005 (2)

Geometric parameters (Å, º) top

Pt1—N4	1.992 (4)	C13—H13B	0.9800
Pt1—N1	1.994 (4)	C13—H13C	0.9800
Pt1—N2	1.995 (4)	C14—H14A	0.9800
Pt1—N3	2.000 (5)	C14—H14B	0.9800
N1—C1	1.343 (6)	C14—H14C	0.9800
N1—C5	1.353 (6)	C15—C17	1.528 (7)
C1—C2	1.377 (7)	C15—C16	1.533 (7)
C1—H1A	0.9500	C15—C18	1.536 (6)
N2—C10	1.349 (6)	C16—H16A	0.9800
N2—C6	1.350 (6)	C16—H16B	0.9800
C2—C3	1.396 (7)	C16—H16C	0.9800
C2—H2A	0.9500	C17—H17A	0.9800
N3—C19	1.118 (7)	C17—H17B	0.9800
C3—C4	1.405 (6)	C17—H17C	0.9800
C3—C11	1.520 (6)	C18—H18A	0.9800
N4—C21	1.119 (7)	C18—H18B	0.9800
C4—C5	1.372 (6)	C18—H18C	0.9800
C4—H4A	0.9500	C19—C20	1.460 (7)
C5—C6	1.474 (6)	C20—H20A	0.9800
C6—C7	1.379 (6)	C20—H20B	0.9800
C7—C8	1.398 (6)	C20—H20C	0.9800
C7—H7A	0.9500	C21—C22	1.462 (7)
C8—C9	1.386 (7)	C22—H22B	0.9800
C8—C15	1.521 (7)	C22—H22C	0.9800
C9—C10	1.368 (8)	C22—H22A	0.9800
C9—H9A	0.9500	F5—B2	1.375 (7)
C10—H10A	0.9500	F1—B1	1.459 (7)
C11—C13	1.532 (7)	F6—B2	1.398 (7)
C11—C14	1.535 (6)	F7—B2	1.392 (6)
C11—C12	1.544 (7)	F8—B2	1.381 (7)
C12—H12A	0.9800	F2—B1	1.374 (7)
C12—H12B	0.9800	F3—B1	1.385 (8)
C12—H12C	0.9800	F4—B1	1.330 (8)
C13—H13A	0.9800

N4—Pt1—N1	176.23 (16)	C11—C13—H13C	109.5
N4—Pt1—N2	95.81 (18)	H13A—C13—H13C	109.5
N1—Pt1—N2	80.47 (18)	H13B—C13—H13C	109.5
N4—Pt1—N3	88.22 (19)	C11—C14—H14A	109.5
N1—Pt1—N3	95.53 (18)	C11—C14—H14B	109.5
N2—Pt1—N3	175.27 (16)	H14A—C14—H14B	109.5
C1—N1—C5	119.5 (4)	C11—C14—H14C	109.5
C1—N1—Pt1	125.0 (3)	H14A—C14—H14C	109.5
C5—N1—Pt1	115.6 (3)	H14B—C14—H14C	109.5
N1—C1—C2	121.7 (5)	C8—C15—C17	110.1 (4)
N1—C1—H1A	119.2	C8—C15—C16	108.8 (4)
C2—C1—H1A	119.2	C17—C15—C16	109.2 (4)
C10—N2—C6	118.8 (4)	C8—C15—C18	112.0 (4)
C10—N2—Pt1	125.4 (4)	C17—C15—C18	107.4 (4)
C6—N2—Pt1	115.5 (3)	C16—C15—C18	109.4 (4)
C1—C2—C3	120.4 (5)	C15—C16—H16A	109.5
C1—C2—H2A	119.8	C15—C16—H16B	109.5
C3—C2—H2A	119.8	H16A—C16—H16B	109.5
C19—N3—Pt1	176.6 (4)	C15—C16—H16C	109.5
C2—C3—C4	116.7 (4)	H16A—C16—H16C	109.5
C2—C3—C11	122.8 (4)	H16B—C16—H16C	109.5
C4—C3—C11	120.6 (4)	C15—C17—H17A	109.5
C21—N4—Pt1	178.7 (5)	C15—C17—H17B	109.5
C5—C4—C3	120.6 (4)	H17A—C17—H17B	109.5
C5—C4—H4A	119.7	C15—C17—H17C	109.5
C3—C4—H4A	119.7	H17A—C17—H17C	109.5
N1—C5—C4	121.2 (4)	H17B—C17—H17C	109.5
N1—C5—C6	114.0 (4)	C15—C18—H18A	109.5
C4—C5—C6	124.8 (4)	C15—C18—H18B	109.5
N2—C6—C7	121.3 (4)	H18A—C18—H18B	109.5
N2—C6—C5	114.0 (4)	C15—C18—H18C	109.5
C7—C6—C5	124.7 (4)	H18A—C18—H18C	109.5
C6—C7—C8	120.8 (4)	H18B—C18—H18C	109.5
C6—C7—H7A	119.6	N3—C19—C20	177.7 (6)
C8—C7—H7A	119.6	C19—C20—H20A	109.5
C9—C8—C7	116.0 (4)	C19—C20—H20B	109.5
C9—C8—C15	123.7 (4)	H20A—C20—H20B	109.5
C7—C8—C15	120.3 (4)	C19—C20—H20C	109.5
C10—C9—C8	121.6 (5)	H20A—C20—H20C	109.5
C10—C9—H9A	119.2	H20B—C20—H20C	109.5
C8—C9—H9A	119.2	N4—C21—C22	178.4 (6)
N2—C10—C9	121.4 (5)	C21—C22—H22B	109.5
N2—C10—H10A	119.3	C21—C22—H22C	109.5
C9—C10—H10A	119.3	H22B—C22—H22C	109.5
C3—C11—C13	109.4 (4)	C21—C22—H22A	109.5
C3—C11—C14	111.3 (4)	H22B—C22—H22A	109.5
C13—C11—C14	108.9 (4)	H22C—C22—H22A	109.5
C3—C11—C12	109.0 (4)	F4—B1—F2	113.9 (7)
C13—C11—C12	108.5 (4)	F4—B1—F3	113.8 (5)
C14—C11—C12	109.7 (4)	F2—B1—F3	108.6 (4)
C11—C12—H12A	109.5	F4—B1—F1	109.1 (5)
C11—C12—H12B	109.5	F2—B1—F1	105.1 (5)
H12A—C12—H12B	109.5	F3—B1—F1	105.6 (6)
C11—C12—H12C	109.5	F5—B2—F8	110.2 (5)
H12A—C12—H12C	109.5	F5—B2—F7	109.1 (5)
H12B—C12—H12C	109.5	F8—B2—F7	110.0 (4)
C11—C13—H13A	109.5	F5—B2—F6	108.0 (5)
C11—C13—H13B	109.5	F8—B2—F6	110.7 (5)
H13A—C13—H13B	109.5	F7—B2—F6	108.7 (5)

Intermolecular H···F distances (Å) between all eight fluorine atoms of the two BF₄^- anions top

F1···H1A	2.16	F5ⁱⁱⁱ···H7A^iv	2.30
F1···H20B	2.43	F5ⁱⁱⁱ···H4A^iv	2.35
F2···H9Aⁱⁱ	2.43	F6ⁱⁱⁱ···H20Cⁱ	2.28
F3···H9Aⁱⁱ	2.57	F7ⁱⁱⁱ···H20A	2.34
F4···H2A	2.43 (4)	F8ⁱⁱⁱ···H22C	2.34

Symmetry codes: (i) -x, y, 1/2 - z; (ii) x, 1 - y, 1/2 + z; (iii) 1/2 - x, 1/2 + y, z; (iv) x, 1 + y, z.

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Crystal structure of bis­(aceto­nitrile-κN)(4,4′-di-tert-butyl-2,2′-bi­pyridine-κ2N,N′)platinum(II) bis­(tetra­fluorido­borate) packing as head-to-head dimers

Supporting information

Key indicators

checkCIF/PLATON results

Crystal structure of bis(acetonitrile-κN)(4,4′-di-tert-butyl-2,2′-bipyridine-κ²N,N′)platinum(II) bis(tetrafluoridoborate) packing as head-to-head dimers