Inorganic-organic hybrid composites containing MQ (II-VI) slabs: A new class of nanostructures with strong quantum confinement and periodic arrangement
Xy. Huang et al., Inorganic-organic hybrid composites containing MQ (II-VI) slabs: A new class of nanostructures with strong quantum confinement and periodic arrangement, CHEM MATER, 13(10), 2001, pp. 3754-3759
A new class of nanostructures has been prepared and characterized. These na
nocomposite hybrid materials are composed of two-dimensional MQ (II-VI) sla
bs and organic bifunctional molecules that act as links as well as spacers.
The most intriguing properties of these nanostructures are that they exhib
it strong quantum confinement effect while possessing a perfectly periodic
arrangement. The crystal structures of [MnSe(en)(0.5)] (1; en = ethylenedia
mine), [MnSe(pda)(0.5)] (2; pda = propanediamine), [ZnSe(en)(0.5)] (3), and
[ZnSe(pda)(0.5)] (4) have been analyzed by single crystal and powder X-ray
diffraction methods. Compounds 1 and 3 are isostructural and crystallize i
n orthorhombic crystal system, space group Pbca (No. 61), Z = 4. Crystal da
ta for 1: a = 6.711(1), b = 6.614(1), c = 17.720(4) Angstrom, For 3: a = 6.
6326(7), b = 6.4630(6), c = 17.3540(16) Angstrom. Compounds 2 and 4 are iso
structural and crystallize in orthorhombic crystal system, space group Cmc2
(1) (No. 36), Z = 4. Crystal data for 2: a = 20.384(4), b = 6.719(1), c = 6
.565(1) Angstrom. For 4: a = 19.9731(18), b = 6.6268(7), c = 6.4394(6) Angs
trom. The optical absorption experiments show that both 3 and 4 generate a
very large blue shift in the absorption edge (1.4-1.5 eV), and both compoun
ds are thermally stable up to 250 degreesC.