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Molecular Crystals

Molecular Crystals. Molecular Crystals: Consist of repeating arrays of molecules and/or ions. C 17 H 24 NO 2 + Cl - . 3 H 2 O. Although Z = 2, the unit cell contains portions of a number of molecules. Cl -. Cl -. Cl -. H 2 O. Hydrogen bonds. Cl OH 2. Cl -. H 2 O.

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Molecular Crystals

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  1. Molecular Crystals

  2. Molecular Crystals: Consist of repeating arrays of molecules and/or ions.

  3. C17H24NO2+ Cl- . 3 H2O

  4. Although Z = 2, the unit cell contains portions of a number of molecules.

  5. Cl-

  6. Cl-

  7. Cl- H2O

  8. Hydrogen bonds Cl OH2 Cl- H2O

  9. Hydrogen bond

  10. Model with atoms having VDW radii.

  11. C17H24NO2+ Cl- . 3 H2O Although this material is ionic, the + and - charges are not close enough to contribute to the formation of the crystal.

  12. Molecular crystals tend to be held together by forces weaker than chemical bonds. van der Waal’s forces are always a factor. Hydrogen bonding is often present.

  13. A layer in an ionic solid with ions of similar radii.

  14. Metallic crystal – single layer of like sized atoms forms hexagonal array.

  15. Second layer can start at a point designated b or c.

  16. At this point, the third layer can repeat the first and start at a or it can start at c.

  17. Third layer repeats first layer.

  18. Unit Cell Unit cell volume = V

  19. Unit Cell Unit cell volume = V V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos  Note: text page 807 may not be correct.

  20. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  21. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  22. cos 90o = 0 V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  23. cos 90o = 0 V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  24. cos 90o = 0 V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos  V = abc 1 -cos2

  25. cos 90o = 0 V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos  sin x = 1 - cos2x V = abc 1 -cos2

  26. cos 90o = 0 V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos  sin x = 1 - cos2x V = abc 1 -cos2 V = abc sin 

  27. cos 90o = 0 V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  28. cos 90o = 0 V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  29. cos 90o = 0 V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos  V = abc

  30. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  31. a = b V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  32. a = b V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos  V = a2c

  33. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  34. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  35. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos  V = a3

  36. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  37. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  38. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  39. V = abc 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

  40. V = a2c 1- cos2 - cos2 - cos2  + 2 cos  cos  cos 

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