An inorganic−organic hybrid material, [HMTAH] 2 [{Zn(H 2 O) 5 }{Zn(H 2 O) 4 }{Mo 7 O 24 }]⋅2H 2 O (1) (where HMTAH = protonated hxamethylenetetramine) has been synthesized and structurally characterized. The compound 1 crystallizes in a monoclinic space group C2/c. The crystal data of 1: a = 43⋅12(3), b = 12⋅399(10), c = 16⋅285(13), β = 111⋅131(11), Z = 8. Its crystal structure shows that two different Zn(II)-aqua complexes, [Zn(H 2 O) 5 ] 2+ and [Zn(H 2 O) 4 ] 2+ are covalently coordinated to a heptamolybdate anion [Mo 7 O 24 ] 6resulting in an anionic species of polyoxometalate supported zinc-aqua complexes, [{Zn(H 2 O) 5 }{Zn(H 2 O) 4 }{Mo 7 O 24 }] 2-, that is stabilized with two protonated hexamethylenetetramine cations in the title compound 1. In the crystal structure, both lattice water molecules are found to interact with the heptamolybdate cluster anion and the protonated hexamethylenetetramine cation resulting in an intricate three-dimensional hydrogen bonding network. Interestingly, compound 1 exhibits catalytic activity towards oxidation of some primary alcohols.
[1] We investigate crustal properties beneath the deep crustal ($35 km) Jabalpur earthquake of 21 May 1997, Narmada-Son Lineament (NSL), central India, in search of a possible cause of stress accumulation in the region. Teleseismic receiver functions computed at nine digital seismographs along a 250 km long profile suggests Moho downwarp to $52 km across the width of the lineament, in contrast with an average 40 km depth elsewhere. In addition, the crust beneath the NSL has higher V p /V s of 1.84 compared to $1.73 in the surrounding, suggestive of a high-density mafic mass at depth that compensates the crustal root, also supported by small topographic variation (200 m) across the lineament. Presence of such an anomalous mass in the deep crust may lead to gravitationally induced stresses in the lower crust that contribute to the failure of rock along the pre-existing Narmada-Son fault leading to the earthquake in deep crust.
AC conductivity, dielectric constant, loss and electric modulus of Sodium nitrate system have been studied in the frequency range from 1Hz to 10MHz and in the temperature range from 303 K to 563 K by employing impedance spectroscopy. The frequency dependent ac conductivity follows Jonscher's universal power law. Dimensionless frequency exponent (n), dispersion parameter (A) are determined. The change over frequency independent conductivity to frequency dependent conductivity at all temperatures shows the relaxation mechanism. The variation of real part of dielectric constant with frequency shows strong dispersion at low frequencies and saturation at high frequencies. The presence of peaks in the frequency plots of dielectric loss, imaginary parts of impedance and modulus are attributed to the relaxation processes. It is also confirmed by the temperature dependence study of real part of dielectric constant. The activation energy from relaxation processes and conductivity has been evaluated.
We geomorphometrically characterize the tectonics near the microseismically active Nanded region, Maharashtra, India. We used the geomorphic indices of active tectonics in 32 sub-basins to evaluate the relationship between tectonics and basin morphology. The area is divided into three different zones (1, 2 and 3). Microseismicity is concentrated along the NW–SE-trending Urvashi Ghat Lineament. The anomalous drainages and lineaments are also confined to the region where microseismicity is associated with thrust. Spatial analysis of the elongation ratio and hypsometric integral of the basins provide valuable information on their distribution and relationship to the structure and tectonics. This study suggests neotectonic control on the evolution of the basins close to Nanded City.
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