Dimers cubic phases

Through the hydrogen bonds, dimers and other molecular assemblies are formed, which in the presence of additional lateral interactions constitute the cubic structure. It has been shown [2] that, e.g., the loss of the lateral dipole moment by substitution of the NO2 group (compound la-2) by a hydrogen or chlorine atom results in the loss of the cubic phase. 

In addition to [SnSe4] anions, [Sn2Se6] dimers could also form mesophases in combination with Pt + in the presence oflong-chain pyridinium surfactants (C PyBr,n = 18,20). In this case, the cubic symmetry with the space group Ia-3d was preferred. The surfactant molecules could be ion-exchanged reversibly and without loss of the cubic structure and particle morphology. This Pt-Sn-Se phase has a low-energy band gap of 1.7 eV. 

---