An isostructural series of NbO-type porous metal−organic frameworks (MOFs) with different dialkoxy-substituents of formula Cu2(TPTC-OR) (TPTC-OR = 2′,5′-di{alkyl}oxy-[1,1′:4′,1′′-terphenyl]3,3′′,5,5′′-tetracarboxylate, R = Me, Et, Pr, Hex) has been synthesized and characterized. The moisture stability of the materials has been evaluated, and a new superhydrophobic porous MOF has been identified...

Molecular orbital calculations completed on fluoride molecules containing first and second row cations have generated bond lengths, R, that match those observed for coordinated polyhedra in crystals to within ",0.04 A, on average. The calculated bond lengths and those observed for fluoride crystals can be ranked with the expression R = Kp 0.22, where p = sir, s is the Pauling strength of the bo...

soil and sludge samples based on it, in addition to the total elemental concentrations (Vercoutere et al., 1995; It is important to evaluate different digestion methods to accurately Quevauviller et al., 1993). In many countries (excluding determine elemental concentrations in soils. Three commonly used digestion procedures, hotplate aqua regia, microwave aqua regia, and the USA), this procedur...

•Simple urea oligomers organize themselves with a single coherent hydrogen-bond chain•Reversing the polarity of hydrogen bonding sends message through molecule•Conformational messages can be transmitted by changes in pH or anion binding•Receipt conformational is indicated remote fluorescent response Despite progress made synthetic chemistry building molecular structures nature, there are still ...