Comparison of crystal structures of Pyridine, Pyrazine, Pyridazine and Pyrimidine

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Compare and contrast the crystal structures of Pyridine, Pyrazine, Pyridazine and Pyrimidine. Where crystalline phase transitions exist, discuss these and compare with other transitions in the other compounds. list of useful links here: [login to view URL] [login to view URL] [login to view URL] [login to view URL](72)85063-2 [login to view URL] [login to view URL] Ideally the article should have two sections: 1. Comparison of the crystal structures a. compare unit cell dimensions b. compare symmetry of crystal structure c. compare molecular orientations and inter-molecular bonding networks 2. comparison of phase transitions a. which compounds have known phase transitions? b. what are the similarities and differences between the transitions? i. how do they occur (temperature, pressure etc.)? ii. what happens to the structure during the transition?

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