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. 2020 Aug 11;11:4009. doi: 10.1038/s41467-020-17815-z

Table 1.

Comparison of X-ray structural parameters of 1–4.

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Compound 2 333 123 423
van der Waals radius of X/Å38 – 1.20 1.85 2.75
Σ (Si)/° 359.79 350.3 345.9 334.5
θ1/° 103.65(4) 93.7(1) 93.17(3) 90.68(5)
θ2/° 128.07(2) 128.3(1) 126.4(1) 121.9(2)
θ3/° 128.07(2) 128.3(1) 126.3(1) 121.9(2)
θ4/° 76.35(4) 86.4(1) 86.83(3) 89.44(8)