Syntheses and structures of two new organically templated borogermanates

Two new organically templated borogermanates, [H(2)DACH] [Ge3B2O9(OH)(2)] (1) (DACH = trans-1,4-diaminocyclohexane) and [H(2)BAPPZ] [Ge3B2O9(OH)(2)](.)1.5H(2)O (2) (BAPPZ = trans-1,4-bis(3-aminopropyl)piperazine), have been synthesized under mild hydrothermal conditions in the presence of DACH and BAPPZ acting as structure-directing agents, respectively. The two compounds both crystallized in an orthorhombic system, space group Pben (No. 60), with the following lattice constants: (1) a = 6.7947(2) Angstrom, b = 11.6963(2) Angstrom, c = 19.9102(3) Angstrom, V = 1582.32(6) Angstrom(3), Z = 4; (2) a = 6.8736(2) Angstrom, b =11.7423(3) Angstrom, c = 27.6476(2) Angstrom, V = 2231.49(9) Angstrom(3), Z = 4. X-ray analysis reveals that the layered structure consists of three- and nine-membered rings formed by strictly alternating two corner-shared germanium tetrahedra and one pair of boron tetrahedra. The diprotonated organic amines exist between the adjacent borogermanate layers and interact with the inorganic framework by extensive hydrogen bonds.