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C28H20Cd3N2O16, triclinic, P1‾$P\overline{1}$ (no. 2), a = 7.3205(3) Å, b = 9.9488(5) Å, c = 10.0326(5) Å, α = 104.473(4)°, β = 91.566(4)°, γ = 90.191(4)°, V = 707.19(6) Å3, Z = 1, Rgt(F) = 0.0239, wRref(F2) = 0.0576, T = 293 K.

C14H19NO3, monoclinic, Cc (no. 9), a = 11.1235(5) Å, b = 15.3724(5) Å, c = 8.1110(3) Å, β = 109.3980(10)°, V = 1308.21(9) Å3, Z = 4, R gt(F) = 0.0300, wR ref(F 2) = 0.0703, T = 170 K.

C13H17NO3, monoclinic, Cc (no. 9), a = 11.6502(8) Å, b = 13.8752(8) Å, c = 7.9644(5) Å, β = 106.051(2)°, V = 1237.25(14) Å3, Z = 4, R gt(F) = 0.0427, wR ref(F 2) = 0.1023, T = 170 K.

C22H27ClN2O3, orthorhombic, P212121 (no. 19), a = 8.6797(3) Å, b = 9.8809(3) Å, c = 24.7824(8) Å, V = 2125.42(12) Å3, Z = 4, Rgt(F) = 0.0478, wRref(F2) = 0.1082, T = 170 K.

C21H18FeO, monoclinic, P21/c (no. 14), a = 5.8577(3) Å, b = 11.2160(5) Å, c = 24.1507(11) Å, β = 92.803(2)°, V = 1584.80(13) Å3, Z = 4, Rgt(F) = 0.0383, wRref(F2) = 0.0755, T = 170 K.

C22H22FeO, monoclinic, P21 (no. 4), a = 10.204(3) Å, b = 5.7956(16) Å, c = 14.591(4) Å, β = 97.876(10)°, V = 854.7(4) Å3, Z = 2, Rgt(F) = 0.0676, wRref(F2) = 0.1647, T = 170 K.

C16H15NO, monoclinic, P21/c (no. 14), a = 5.9233(3) Å, b = 14.5788(9) Å, c = 14.7095(9) Å, β = 99.073(2)°, V = 1254.34(13) Å3, Z = 4, Rgt (F) = 0.0600, wRref (F 2) = 0.1512, T = 170 K.

C23H18FeO, orthorhombic, Pna21 (no. 33), a = 28.3217(11) Å, b = 5.7477(2) Å, c = 10.3071(3) Å, β = 90°, V = 1677.84(10) Å3, Z = 4, Rgt(F) = 0.0372, wRref(F2) = 0.0713, T = 150 K.

Spatial division multiplexed optical transmission over a multi-ring-core orbital angular momentum (OAM) fibre is reported for the first time. The seven cores in the fibre each supports OAM modes belonging to mode groups (MGs) of topological charge |l| = 0–4. The MGs of |l| = 1–4 each contains four near-degenerate OAM modes that carry the combinations of opposite orbital and spin angular momenta. The weak coupling between these higher-order MGs as well as between the cores enables the simultaneous transmission of 56 OAM mode channels (two MGs per core of the topological charges |l| = 2 and 3) over the 60-km span, while only requiring modular 4 × 4 multi-input multi-output (MIMO) signal processing to equalize the mixing among the four mode channels in each MG that are strongly coupled – a feature that also minimizes the number of filter taps. The mode channels are launched using seven-core single-mode fibre fan-in devices, with the light in all seven cores converted into OAM modes via specially designed plates that carry seven off-axis-compensated phase masks matching the hexagonal configuration of the multi-core fibres. Each mode channel carries 10 WDM wavelengths, equivalently aggregating to a capacity of 31.4 Tbit/s (net 25.1 Tb/s) and a spectral efficiency (SE) of 62.7 bit/s/Hz (net 50.2 bit/s/Hz) with 28-GBaud QPSK modulation per data channel.