1 features a 2D layer formed by B–O clusters, which further linked by H-bonding to form a 3D framework. 2 is a 3D porous-layered aluminoborate with seven types of interesting channel systems built by three types of B–O clusters and AlO4 units.
Two layered galloborates (GBOs), Na3GaB4O9 (1) and Na5Ga[B7O12-(OH)]2‧2B(OH)3 (2), have been solvothermally made. 1 exhibits the unpreceeded layer built by GaO4 tetrahedra and B4O9 clusters. 2 was made by raising...
The two acentric aluminoborates (ABOs)
[M(dap)3]2{Al[B5O7(OH)3][B5O8(OH)2][B6O9(OH)2]} (M and dap represent Co(1)/Ni(2) and 1,2-diaminopropane, respectively) templated
by chiral metal
complexes (CMCs) have been solvothermally synthesized. The isostructural 1 and 2 crystallize in the chiral space group P21. Both feature unprecedented 2D wavelike layers
built by three kinds of oxoboron (B–O) clusters ([B5O7(OH)3]2–, [B5O8(OH)2]3–, and [B6O9(OH)2]2–) and AlO4 tetrahedra. In the frameworks of 1 and 2, AlO4 and [B6O9(OH)2]2– units are strictly alternating into 1D chains.
Further, [B5O8(OH)2]3– clusters link adjacent chains to form 2D wavelike layers. In addition,
the [B5O7(OH)3]2– units as the hanging clusters are supported on two sides of the
wavelike layers through AlO4 groups, resulting in the first
example of a wavelike layer ABO composed of three kinds of B–O
clusters and four types of channels. 1 and 2 display second-harmonic generation (SHG) signals about ∼1.3
and ∼0.93 times that of KH2PO4 (KDP)
and belong to the class of wide-band-gap semiconductors.
Three
inorganic–organic hybrid gallo-/alumino-borates [Ga2B7O14(OH)]·H2dah (1, dah = 1,6-diaminohexane), K2[Ga2B7O14(OH)(en)0.5] (2, en
= ethylenediamine), and K2[Al2B7O14(OH)(en)0.5]·H2O (3) were synthesized under solvothermal conditions. Compound 1 features a 3D porous-layered structure built by the alternation
of [GaB4O10(OH)]6–, [B3O6]3– clusters and GaO4 tetrahedra, in which the novel [GaB4O10(OH)]6– cluster is first observed. Compounds 2 and 3 are isostructural and made by [MB4O10(OH)]6–, [B3O6(en)0.5]3– clusters and MO4 tetrahedra (M = Ga/Al); their 3D porous layers are similar to those
of 1 and further bridged by en linkers through the rare
B–N–C covalent bonds, resulting in the 3D inorganic–organic
hybrid framework. This is the first main-group metal borate with organic
molecules participating in the oxoboron frameworks through B–N
bonds. Optical diffuse-reflectance spectra reveal that 1, 2, and 3 are potential wide-band-gap
semiconductors.
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