Crystal structure of poly[μ-diphen­yl(pyridin-4-yl)phosphane-κ2N:P-μ-tri­fluoro­acetato-κ2O:O′-silver(I)] from synchrotron data

Song, J.; Lee, Y.-A.; Kim, D.

doi:10.1107/S2056989025011302

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Volume 82| Part 1| January 2026| Pages 96-98

https://doi.org/10.1107/S2056989025011302

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Crystal structure of poly[μ-diphenyl(pyridin-4-yl)phosphane-κ²N:P-μ-trifluoroacetato-κ²O:O′-silver(I)] from synchrotron data

Jiyeong Song,^a Young-A Lee ^a ^* and Dongwon Kim ^b ^*

^aDepartment of Chemistry, Jeonbuk National University, Jeonju 54896, Republic of Korea, and ^bBeamline Department, Pohang Acceleratory Laboratory, Pohang 37673, Republic of Korea
^*Correspondence e-mail: [email protected], [email protected]

Edited by W. T. A. Harrison, University of Aberdeen, United Kingdom (Received 28 November 2025; accepted 15 December 2025; online 1 January 2026)

The crystal structure of the title compound, [Ag(CF₃CO₂)(C₁₇H₁₄NP)] has been determined from synchrotron data (λ = 0.70000 Å). Centrosymmetric dinuclear Ag₂O₂ units, generated by inversion centers, extend into a two-dimensional coordination polymer linked by the N and P atoms of the bridged-bidentate (μ²) ligand. The resulting two-dimensional array can be described as a 6³ (hcb) network.

Keywords: crystal structure; diphenyl-4-pyridylphosphine ligand; silver(I); coordination polymer; trifluoroacetate.

CCDC reference: 2515821

1. Chemical context

Research on the construction and packing motifs of two-dimensional coordination networks is of interest due to their many applications such as adsorption/desorption, molecular recognition, separation, energy transfer template, chemo-sensors, ion exchangers, drying agents, nuclear waste storage, crystal structure templates of liquids and heterogeneous catalysis (Kim et al., 2022 ) via the stretching and sliding between layers (Kim et al., 2021 ). Thus, new types of two-dimensional coordination frameworks have been constructed by the self-assembly of metal cations as a geometric component and designed multidonor ligands as a spacer. Furthermore, such frameworks could be rationally designed by controlling weakly coordinating (counter)anions due to the less effective electrostatic binding interactions. Anion chemistry has emerged as an active field owing to a timely interest from environmental pollution, industrial chemicals, biological process, ionic liquids, catalysis, lithium battery, and health-related perspectives (Beer & Gale, 2001 ). Among ligands, diphenyl-4-pyridyl phosphine spacers exhibit delicate differences in the size, lone-pair delocalization, conformational energy barrier, and donating ability (Wang et al., 2004 ). Here, we describe the synthesis and crystal structure of the title coordination polymer [Ag(CF₃CO₂)(C₁₇H₁₄NP)]_n, (I).

2. Structural commentary

The metal ion in (I) is coordinated by the N and P atoms of two diphenyl-4-pyridyl phosphine (L) ligands (one symmetry generated) and two O-atom donors of the bridging trifluoroacetate anions (one symmetry generated) and selected bond lengths and angles are listed in Table 1. This results in a very distorted AgO₂NP tetrahedral arrangement (Fig. 1) with the N—Ag—P bond angle being 142.00 (6)°. The O atoms bridge to an adjacent silver atom, which thus forms a centrosymmetric dinuclear unit generated by an inversion center at (1/2, 1, 1/2) for the asymmetric atoms. A short Ag1⋯O2(1 − x, 2 − y, 1 − z) contact of 2.764 (2) Å arises within the dimer.

Table 1
Selected geometric parameters (Å, °)

Ag1—N1	2.242 (2)	Ag1—O1	2.463 (2)
Ag1—P1ⁱ	2.3594 (7)	Ag1—O1ⁱⁱ	2.588 (2)

N1—Ag1—P1ⁱ	142.00 (6)	N1—Ag1—O1ⁱⁱ	113.05 (7)
N1—Ag1—O1	87.13 (8)	P1ⁱ—Ag1—O1ⁱⁱ	98.45 (5)
P1ⁱ—Ag1—O1	117.84 (6)	O1—Ag1—O1ⁱⁱ	84.18 (7)
Symmetry codes: (i) $[-x+1, y+{\script{1\over 2}}, -z+{\script{1\over 2}}]$ ; (ii) .

Figure 1
The asymmetric unit of (I) expanded to show the complete silver-ion coordination sphere with displacement ellipsoids drawn at the 30% probability level. [Symmetry codes: (i) −x + 1, −y + 2, −z + 1; (ii) −x + 1, y + $[{1\over 2}]$ , −z + $[{1\over 2}]$ ; (iii) −x + 1, y − $[{1\over 2}]$ , −z + $[{1\over 2}]$ .]

The C₁₇H₁₄NP (L) spacer ligand connects two silver(I) ions to give a single polymeric strand propagating in the [010] direction. The two O-atom donors of the trifluoroacetate anion bridge the single strands in an ‘up and down' mode and the resulting extended structure is a two-dimensional coordination polymer propagating in the (100) plane, as shown in Fig. 2, with an hcb 6³ topology (O'Keeffe et al., 2008 ). The double-bridge via the two acetate O atoms induces an Ag⋯Ag(1 − x, 2 − y, 1 − z) distance of 3.7495 (8) Å, which is probably too long to be regarded as an argentophilic (Pyykkö, 1997 ) silver–silver ‘bond'. A weak C—H⋯O interaction (Table 2, Fig. 3) may help to consolidate the sheets. No directional interactions could be identified in the inter-layer packing.

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C1—H1⋯O1	0.94	2.53	3.160 (3)	124

Figure 2
Schematic representation of the hcb (6³) topology of title compound. Topological analysis was performed with a metal-centered simplification, treating the central point between the Ag₂ pairs as nodes and the diphenyl(4-pyridyl)phosphane ligands as linkers.

Figure 3
The two-dimensional network structure of title compound. For clarity, H atoms have been omitted.

3. Database survey

A search of the Cambridge Structural Database (CSD, version 6.00 with updates through April 2025; Groom et al., 2016 ) using ConQuest was made for metal complexes containing diphenyl(4-pyridyl)phosphane ligands. Among the 18 hits retrieved, no closely related structure to the title complex was found.

4. Synthesis and crystallization

A solution was prepared by dissolving AgCF₃CO₂ (4.42 mg, 0.020 mmol) in acetone, and another solution was prepared by dissolving diphenyl-4-pyridyl phosphine (5.27 mg, 0.020 mmol) in ethanol. Slow diffusion of the two solutions over several days afforded colorless block-shaped crystals of (I) suitable for X-ray diffraction. Yield: 8.33 mg (86%).

5. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 3. All H atoms were placed in geometrically idealized positions and constrained to ride on their parent atoms, with C—H = 0.94 Å and U_iso(H) = 1.2 U_eq(carrier). The F atoms of the –CF₃ group are disordered over two sets of sites in a 0.510 (13):0.490 (13) ratio.

Table 3
Experimental details

Crystal data
Chemical formula	[Ag(C₂F₃O₂)(C₁₇H₁₄NP)]
M_r	484.15
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	223
a, b, c (Å)	11.683 (2), 14.843 (3), 11.335 (2)
β (°)	103.68 (3)
V (Å³)	1909.8 (7)
Z	4
Radiation type	Synchrotron, λ = 0.700 Å
μ (mm⁻¹)	1.12
Crystal size (mm)	0.30 × 0.22 × 0.12

Data collection
Diffractometer	Rayonix MX225HS CCD area detector
Absorption correction	Multi-scan (HKL3000sm SCALEPACK; Otwinowski et al., 2003 )
T_min, T_max	0.939, 1.000
No. of measured, independent and observed [I > 2σ(I)] reflections	19907, 5327, 4578
R_int	0.042
(sin θ/λ)_max (Å⁻¹)	0.704

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.043, 0.116, 1.11
No. of reflections	5327
No. of parameters	272
No. of restraints	36
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.40, −1.86
Computer programs: PAL BL2D-SMDC Program (Shin et al., 2016 ), HKL3000sm (Otwinowski & Minor, 2003), SHELXT2018 (Sheldrick, 2015a ), SHELXL2018 (Sheldrick, 2015b ), DIAMOND (Putz & Brandenburg, 2014 ) and publCIF (Westrip, 2010 ).

Supporting information

CCDC reference: 2515821

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2056989025011302/hb8176sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989025011302/hb8176Isup2.hkl

CSD search file. DOI: https://doi.org/10.1107/S2056989025011302/hb8176sup3.pdf

checkCIF report

Computing details top

Poly[µ-diphenyl(pyridin-4-yl)phosphane-κ²N:P-µ-trifluoroacetato-κ²O:O'-silver(I)] top

Crystal data top

[Ag(C₂F₃O₂)(C₁₇H₁₄NP)]	F(000) = 960
M_r = 484.15	D_x = 1.684 Mg m⁻³
Monoclinic, P2₁/c	Synchrotron radiation, λ = 0.700 Å
a = 11.683 (2) Å	Cell parameters from 40378 reflections
b = 14.843 (3) Å	θ = 0.4–29.5°
c = 11.335 (2) Å	µ = 1.12 mm⁻¹
β = 103.68 (3)°	T = 223 K
V = 1909.8 (7) Å³	Block, colorless
Z = 4	0.30 × 0.22 × 0.12 mm

Data collection top

Rayonix MX225HS CCD area detector diffractometer	4578 reflections with I > 2σ(I)
Radiation source: PLSII 2D bending magnet	R_int = 0.042
ω scan	θ_max = 29.5°, θ_min = 2.2°
Absorption correction: multi-scan (HKL3000sm Scalepack; Otwinowski et al., 2003)	h = −16→16
T_min = 0.939, T_max = 1.000	k = −20→20
19907 measured reflections	l = −14→14
5327 independent reflections

Refinement top

Refinement on F²	Primary atom site location: dual
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.043	H-atom parameters constrained
wR(F²) = 0.116	w = 1/[σ²(F_o²) + (0.0728P)² + 0.3483P] where P = (F_o² + 2F_c²)/3
S = 1.11	(Δ/σ)_max = 0.001
5327 reflections	Δρ_max = 0.40 e Å⁻³
272 parameters	Δρ_min = −1.86 e Å⁻³
36 restraints

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.

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

	x	y	z	U_iso*/U_eq	Occ. (<1)
C3	0.35805 (18)	0.68394 (14)	0.2085 (2)	0.0271 (4)
C4	0.3393 (2)	0.76130 (16)	0.1382 (2)	0.0355 (5)
H4	0.288044	0.760537	0.060553	0.043*
C5	0.3975 (2)	0.83998 (17)	0.1840 (2)	0.0391 (5)
H5	0.383473	0.892220	0.135841	0.047*
C6	0.17431 (19)	0.60043 (15)	0.0265 (2)	0.0299 (4)
C7	0.2086 (2)	0.6029 (2)	−0.0828 (2)	0.0411 (5)
H7	0.287002	0.589939	−0.084168	0.049*
C8	0.1274 (3)	0.6243 (2)	−0.1901 (3)	0.0525 (7)
H8	0.151235	0.626321	−0.263645	0.063*
C9	0.0125 (3)	0.6427 (2)	−0.1886 (3)	0.0567 (8)
H9	−0.042092	0.657774	−0.260991	0.068*
C10	−0.0227 (3)	0.6389 (3)	−0.0807 (3)	0.0659 (10)
H10	−0.101556	0.650869	−0.080129	0.079*
C11	0.0577 (2)	0.6176 (2)	0.0269 (3)	0.0487 (7)
H11	0.033058	0.614747	0.099967	0.058*
C12	0.2249 (2)	0.54983 (16)	0.2876 (2)	0.0315 (4)
C13	0.1573 (2)	0.61216 (19)	0.3340 (2)	0.0404 (5)
H13	0.138279	0.668030	0.295284	0.048*
C14	0.1185 (3)	0.5915 (2)	0.4371 (3)	0.0511 (7)
H14	0.071082	0.632748	0.466804	0.061*
C15	0.1493 (3)	0.5101 (3)	0.4971 (3)	0.0549 (8)
H15	0.124504	0.497203	0.568348	0.066*
C16	0.2158 (3)	0.4488 (2)	0.4520 (3)	0.0525 (7)
H16	0.235659	0.393394	0.491779	0.063*
C17	0.2539 (3)	0.46832 (17)	0.3475 (3)	0.0402 (6)
H17	0.299643	0.426076	0.317180	0.048*
C18	0.6472 (2)	0.90684 (16)	0.6714 (2)	0.0352 (5)
C19	0.7446 (3)	0.8351 (2)	0.6859 (3)	0.0579 (8)
Ag1	0.56236 (2)	0.97380 (2)	0.36594 (2)	0.03465 (8)
P1	0.28994 (5)	0.57488 (4)	0.16075 (5)	0.02680 (12)
O1	0.57810 (19)	0.91102 (15)	0.57033 (18)	0.0479 (5)
N1	0.47206 (18)	0.84526 (14)	0.29276 (19)	0.0352 (4)
C1	0.4910 (2)	0.76980 (18)	0.3596 (2)	0.0418 (6)
H1	0.543413	0.772179	0.436476	0.050*
O2	0.6465 (2)	0.95088 (17)	0.7623 (2)	0.0584 (6)
C2	0.4374 (2)	0.68904 (17)	0.3208 (2)	0.0402 (6)
H2	0.454302	0.637557	0.370122	0.048*
F1A	0.8505 (5)	0.8723 (6)	0.7220 (11)	0.098 (3)	0.490 (13)
F2A	0.7521 (10)	0.7926 (10)	0.5923 (11)	0.131 (6)	0.490 (13)
F3A	0.7391 (10)	0.7777 (8)	0.7754 (14)	0.129 (5)	0.490 (13)
F1B	0.8208 (12)	0.8362 (9)	0.7831 (10)	0.152 (6)	0.510 (13)
F2B	0.7951 (11)	0.8384 (10)	0.5961 (13)	0.148 (6)	0.510 (13)
F3B	0.6952 (7)	0.7545 (3)	0.6669 (13)	0.108 (4)	0.510 (13)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C3	0.0229 (9)	0.0185 (9)	0.0390 (10)	0.0001 (7)	0.0055 (7)	−0.0020 (7)
C4	0.0365 (12)	0.0235 (11)	0.0417 (12)	−0.0019 (9)	−0.0003 (9)	0.0029 (9)
C5	0.0459 (14)	0.0225 (11)	0.0447 (13)	−0.0042 (10)	0.0027 (10)	0.0045 (9)
C6	0.0252 (10)	0.0194 (10)	0.0420 (11)	−0.0016 (7)	0.0018 (8)	−0.0020 (8)
C7	0.0388 (13)	0.0396 (14)	0.0434 (13)	0.0016 (11)	0.0068 (10)	−0.0017 (10)
C8	0.0578 (18)	0.0528 (19)	0.0421 (15)	−0.0041 (15)	0.0022 (12)	−0.0001 (12)
C9	0.0498 (17)	0.0537 (19)	0.0544 (16)	−0.0058 (14)	−0.0120 (13)	0.0035 (14)
C10	0.0270 (13)	0.091 (3)	0.072 (2)	0.0048 (15)	−0.0051 (13)	0.0061 (19)
C11	0.0266 (12)	0.064 (2)	0.0531 (15)	0.0044 (12)	0.0051 (10)	0.0049 (13)
C12	0.0280 (10)	0.0255 (10)	0.0399 (12)	−0.0044 (8)	0.0060 (8)	−0.0012 (8)
C13	0.0358 (12)	0.0356 (13)	0.0508 (14)	0.0005 (10)	0.0123 (10)	−0.0028 (10)
C14	0.0417 (15)	0.060 (2)	0.0552 (17)	−0.0048 (13)	0.0178 (12)	−0.0128 (14)
C15	0.0527 (18)	0.069 (2)	0.0431 (16)	−0.0190 (16)	0.0112 (12)	0.0012 (14)
C16	0.0583 (19)	0.0473 (17)	0.0491 (16)	−0.0135 (15)	0.0070 (13)	0.0109 (13)
C17	0.0433 (15)	0.0316 (13)	0.0442 (14)	−0.0018 (10)	0.0074 (11)	0.0046 (9)
C18	0.0306 (11)	0.0244 (11)	0.0487 (13)	−0.0007 (8)	0.0057 (9)	0.0011 (9)
C19	0.0427 (16)	0.0526 (19)	0.074 (2)	0.0143 (14)	0.0052 (14)	−0.0084 (16)
Ag1	0.03016 (12)	0.02218 (11)	0.05095 (14)	−0.00674 (6)	0.00828 (8)	−0.00112 (6)
P1	0.0226 (3)	0.0167 (2)	0.0394 (3)	−0.00019 (18)	0.0039 (2)	−0.00062 (19)
O1	0.0444 (11)	0.0526 (13)	0.0439 (10)	0.0006 (9)	0.0047 (8)	0.0074 (9)
N1	0.0329 (10)	0.0222 (9)	0.0482 (11)	−0.0044 (7)	0.0049 (8)	−0.0011 (8)
C1	0.0403 (13)	0.0287 (12)	0.0480 (13)	−0.0061 (10)	−0.0063 (10)	0.0012 (10)
O2	0.0557 (14)	0.0507 (13)	0.0622 (14)	0.0094 (11)	0.0011 (10)	−0.0211 (11)
C2	0.0399 (13)	0.0248 (11)	0.0470 (13)	−0.0042 (10)	−0.0075 (10)	0.0056 (9)
F1A	0.026 (2)	0.112 (6)	0.148 (8)	0.003 (3)	0.006 (3)	−0.011 (5)
F2A	0.091 (6)	0.148 (9)	0.134 (8)	0.060 (6)	−0.009 (5)	−0.092 (7)
F3A	0.107 (6)	0.100 (7)	0.194 (11)	0.066 (5)	0.063 (7)	0.099 (7)
F1B	0.135 (9)	0.154 (10)	0.115 (7)	0.104 (8)	−0.074 (6)	−0.052 (6)
F2B	0.121 (8)	0.169 (10)	0.199 (11)	0.054 (7)	0.124 (8)	0.026 (8)
F3B	0.102 (5)	0.028 (2)	0.194 (10)	0.025 (3)	0.035 (6)	0.003 (4)

Geometric parameters (Å, º) top

C3—C4	1.385 (3)	C15—C16	1.372 (6)
C3—C2	1.388 (3)	C16—C17	1.391 (4)
C3—P1	1.828 (2)	C18—O2	1.222 (3)
C4—C5	1.389 (3)	C18—O1	1.238 (3)
C5—N1	1.333 (3)	C18—C19	1.538 (4)
C6—C11	1.387 (3)	C19—F1B	1.242 (7)
C6—C7	1.390 (3)	C19—F2A	1.255 (8)
C6—P1	1.820 (2)	C19—F2B	1.292 (9)
C7—C8	1.391 (4)	C19—F3B	1.325 (7)
C8—C9	1.374 (5)	C19—F1A	1.327 (7)
C9—C10	1.380 (5)	C19—F3A	1.339 (8)
C10—C11	1.389 (4)	Ag1—N1	2.242 (2)
C12—C17	1.390 (3)	Ag1—P1ⁱ	2.3594 (7)
C12—C13	1.397 (4)	Ag1—O1	2.463 (2)
C12—P1	1.816 (2)	Ag1—O1ⁱⁱ	2.588 (2)
C13—C14	1.384 (4)	N1—C1	1.341 (3)
C14—C15	1.391 (5)	C1—C2	1.376 (3)

C4—C3—C2	117.6 (2)	F2A—C19—F3A	110.2 (8)
C4—C3—P1	124.43 (17)	F1A—C19—F3A	103.9 (6)
C2—C3—P1	117.97 (17)	F1B—C19—C18	116.3 (5)
C3—C4—C5	119.0 (2)	F2A—C19—C18	117.1 (5)
N1—C5—C4	123.4 (2)	F2B—C19—C18	110.7 (6)
C11—C6—C7	119.2 (2)	F3B—C19—C18	108.9 (4)
C11—C6—P1	124.9 (2)	F1A—C19—C18	110.9 (5)
C7—C6—P1	115.93 (18)	F3A—C19—C18	110.8 (4)
C6—C7—C8	120.3 (3)	N1—Ag1—P1ⁱ	142.00 (6)
C9—C8—C7	120.0 (3)	N1—Ag1—O1	87.13 (8)
C8—C9—C10	120.0 (3)	P1ⁱ—Ag1—O1	117.84 (6)
C9—C10—C11	120.4 (3)	N1—Ag1—O1ⁱⁱ	113.05 (7)
C6—C11—C10	120.0 (3)	P1ⁱ—Ag1—O1ⁱⁱ	98.45 (5)
C17—C12—C13	119.1 (2)	O1—Ag1—O1ⁱⁱ	84.18 (7)
C17—C12—P1	117.8 (2)	C12—P1—C6	109.72 (11)
C13—C12—P1	122.8 (2)	C12—P1—C3	100.46 (10)
C14—C13—C12	119.9 (3)	C6—P1—C3	104.35 (10)
C13—C14—C15	120.5 (3)	C12—P1—Ag1ⁱⁱⁱ	115.27 (8)
C16—C15—C14	119.9 (3)	C6—P1—Ag1ⁱⁱⁱ	116.50 (8)
C15—C16—C17	120.2 (3)	C3—P1—Ag1ⁱⁱⁱ	108.70 (7)
C12—C17—C16	120.5 (3)	C18—O1—Ag1	140.99 (19)
O2—C18—O1	128.4 (3)	C18—O1—Ag1ⁱⁱ	95.32 (17)
O2—C18—C19	115.6 (3)	Ag1—O1—Ag1ⁱⁱ	95.82 (7)
O1—C18—C19	116.0 (2)	C5—N1—C1	117.2 (2)
F1B—C19—F2B	109.5 (9)	C5—N1—Ag1	122.66 (17)
F1B—C19—F3B	110.4 (7)	C1—N1—Ag1	120.10 (16)
F2B—C19—F3B	99.7 (7)	N1—C1—C2	123.1 (2)
F2A—C19—F1A	102.9 (7)	C1—C2—C3	119.7 (2)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C1—H1···O1	0.94	2.53	3.160 (3)	124

Funding information

This work was supported by the National Research Foundation of Korea (NRF) grant funded by 2021R1I1A3059982 (YAL) and the Ministry of Science and ICT [RS-2022–00164805 (DK)]. The X-ray crystallography at the PLS-II 2D SMC beamline was supported in part by MSIP and POSTECH.

References

Beer, P. D. & Gale, P. A. (2001). Angew. Chem. Int. Ed. 40, 486–516. CrossRef CAS Google Scholar
Groom, C. R., Bruno, I. J., Lightfoot, M. P. & Ward, S. C. (2016). Acta Cryst. B72, 171–179. Web of Science CrossRef IUCr Journals Google Scholar
Kim, D., Kim, G., Han, J. & Jung, O. S. (2022). Bull. Korean Chem. Soc. 43, 1019–1031. CrossRef CAS Google Scholar
Kim, J., Lee, S., Kim, D., Kim, D. & Jung, O.-S. (2021). Cryst. Growth Des. 21, 2255–2262. CrossRef CAS Google Scholar
O'Keeffe, M., Peskov, M. A., Ramsden, S. J. & Yaghi, O. M. (2008). Acc. Chem. Res. 41, 1782–1789. Web of Science CrossRef PubMed CAS Google Scholar
Otwinowski, Z., Borek, D., Majewski, W. & Minor, W. (2003). Acta Cryst. A59, 228–234. Web of Science CrossRef CAS IUCr Journals Google Scholar
Putz, H. & Brandenburg, K. (2014). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Pyykkö, P. (1997). Chem. Rev. 97, 597–636. CrossRef PubMed Web of Science Google Scholar
Sheldrick, G. M. (2015a). Acta Cryst. A71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (2015b). Acta Cryst. C71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Shin, J. W., Eom, K. & Moon, D. (2016). J. Synchrotron Rad. 23, 369–373. Web of Science CrossRef IUCr Journals Google Scholar
Wang, Q.-M., Lee, Y.-A., Crespo, O., Deaton, J., Tang, C., Gysling, H. J., Gimeno, M. C., Larraz, C., Villacampa, M. D., Laguna, A. & Eisenberg, R. (2004). J. Am. Chem. Soc. 126, 9488–9489. CrossRef PubMed CAS Google Scholar
Westrip, S. P. (2010). J. Appl. Cryst. 43, 920–925. Web of Science CrossRef CAS IUCr Journals Google Scholar

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