EFFECT OF DIFFERENT AMPHIPHILES AND THEIR MONOLAYERS ON THE CRYSTALLIZATION OF CUSO4-CENTER-DOT-5H(2)O

The crystallization of CuSO4 . 5H(2)O under a series of monolayers, 9- hexadecylimino-4,5-diazafluorene (hidf), 5-hexadecyliminomethyl-8-hydr oxyquinoline (hihq), 8-hexadecyloxyquinoline-2-carboxylic acid (hqa) a nd stearic acid (sa) has been studied. The results demonstrate that th e selection of the amphiphile for controlling oriented crystallization is very important. The hidf monolayer is the best template for orient ed nucleation and growth of CuSO4 . 5H(2)O as its lattice structure ca n match the (010) face of CuSO4 . 5H(2)O perfectly. Furthermore, betwe en CuSO4 . 5H(2)O and Na2SO4 . 7H(2)O, only the hidf monolayer can cho ose CuSO4 . 5H(2)O to nucleate under it. The selection of a suitable p hase of each monolayer for controlling the oriented crystallization is also a key factor in the induced crystallization. For example, when a hqa monolayer is in the gas or liquid phase its ability to induce ori ented crystallization of CuSO4 . 5H(2)O is poor and the best state is not the most condensed one, rather a liquid-solid state. This is attri buted to the co-ordination effect and the lattice matching between the inorganic and organic interfaces. The relationship between the surfac e pressure and area per molecule (pi vs. A curves) and the monolayers' ability to control crystallization is also discussed.