Kupfuura: Pyridine crystallizes in an orthorhombic crystal system with space group Pna21 and lattice parameters a = 1752 pm, b = 897 pm, c = 1135 pm, and 16 formula units per unit cell (measured at 153 K). For comparison, crystalline benzene is also orthorhombic, with space group Pbca, a = 729.2 pm, b = 947.1 pm, c = 674.2 pm (at 78 K), but the number of molecules per cell is only 4. This difference is partly related to the lower symmetry of the individual pyridine molecule (C2v vs D6h for benzene). A trihydrate (pyridine·3H2O) is known; it also crystallizes in an orthorhombic crystal system in the lattice space group Pb, a = 1252 pm, b = 893 pm, and c = 674.2 pm, but the number of molecules per unit cell is only 4. Mubvunzo: Benzene ine orthorhombic crystal system ine space group Pbca, a
masere