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Figure 2 The unit cell of [NH2(CH2CH3)2]+[H2PO4]− with colour scheme: N (orange), O (blue), [H2PO4]-tetrahedra (blue), P (red), C grey) and H (white). Hydrogen bonds (light blue) between H2PO4 tetrahedra and hydrogen bonds (orange) between ammonium groups and H2PO4 tetrahedra are shown. |