U fiirso qoraalka hoose ka dibna ka jawaab su'aasha kadib isla luqadda qoraalka:  Marinka: Pyridine wuxuu ku dhalaalaa nidaam orthorhombic crystal oo leh kooxda booska Pna21 iyo xuduudaha lattice a = 1752 pm, b = 897 pm, c = 1135 pm, iyo 16 unugyada caanaha halkii unug (oo lagu cabiray 153 K). Isbarbar dhig ahaan, crystalline benzene sidoo kale waa orthorhombic, oo leh kooxda booska Pbca, a = 729.2 pm, b = 947.1 pm, c = 674.2 pm (at 78 K), laakiin tirada molecules per cell waa kaliya 4. Farqigaani wuxuu qayb ahaan la xiriiraa isbarbar dhigga hoose ee unugyada pyridine-ka shaqsi ahaaneed (C2v vs D6h ee benzene). A trihydrate (pyridine·3H2O) waa la yaqaan; waxay sidoo kale ku dhalaalaysaa nidaam orthorhombic ah oo ku jira kooxda booska Pbca, xuduudaha lattice a = 1244 pm, b = 1783 pm, c = 679 pm iyo sideed unug oo caanaha ah halkii unug halkii unug (oo lagu qiyaasay 223 K).  Su'aal: Immisa unug oo caadi ah ayaa halkii unug ku jirta?
siddeed