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We consider the transfer of a two-species Bose-Einstein condensate into anoptical lattice with a density such that that a Mott-insulator state with oneatom per species per lattice site is obtained in the deep lattice regime.Depending on collision parameters the result could be either a `mixed' or a`separated' Mott-insulator phase. Such a `mixed' two-species insulator couldthen be photo-associated into an array of dipolar molecules suitable forquantum computation or the formation of a dipolar molecular condensate. For thecase of a $^{87}$Rb-$^{41}$K two-species BEC, however, the large inter-speciesscattering length makes obtaining the desired `mixed' Mott insulator phasedifficult. To overcome this difficulty we investigate the effect of varying thelattice frequency on the mean-field interaction and find a favorable parameterregime under which a lattice of dipolar molecules could be generated

Controlling two-species Mott-insulator phases in an optical lattice to form an array of dipolar molecules