Inorganic Crystals: Copper Sulfate Pentahydrate
Structure Crystal structure Triclinic (pentahydrate), space group P-1, a = 0.5986 nm, b = 0.6141 nm, c = 1.0736 nm, α = 77.333°, β = 82.267°, γ = 72.567° Properties Chemical formula CuSO4·...
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Synthesis and Application of C-Phenylcalix[4]resorcinarene in Adsorption of Cr(III) and Pb(II)
Synthesis and Application of C-Phenylcalix[4]resorcinarene in Adsorption of Cr(III) and Pb(II) Budiana I Gusti M. Ngurah*1, Jumina2, and Chairil Anwar2 1Department of Chemistry, Faculty o...
Read ItDeuteronium deuteroxide. The why of pD 7.435.
Earlier, I constructed a possible model of hydronium hydroxide, or H 3O+.OH - One way of assessing the quality of the model is to calculate the free energy difference between it and two normal wat...
Read ItAn alternative design for the Modern Periodic Table
The Modern Periodic Table, the bedrock of all of Chemistry, has some minor anomalies. The position of Hydrogen is not justified as it resembles both alkali metals and halogens. Helium is placed i...
Read ItTetrahedral or square planar? A ten minute exploration.
I love experiments where the insight-to-time-taken ratio is high. This one pertains to exploring the coordination chemistry of the transition metal region of the periodic table; specifically the te...
Read ItAllotropic halogens.
Allotropes are differing structural forms of the elements. The best known example is that of carbon, which comes as diamond and graphite, along with the relatively recently discovered fullerenes an...
Read ItThe butterfly effect in chemistry: Bimodal M~S bonds?
I noted previously that some 8-ring cyclic compounds could exist in either a planar-aromatic or a non-planar-non-aromatic mode, the mode being determined by apparently quite small changes in a ring...
Read ItTrigonal bipyramidal or square pyramidal: Another ten minute exploration.
This is rather cranking the handle, but taking my previous post and altering the search definition of the crystal structure database from 4- to 5-coordinate metals, one gets the following. Fe … ...
Read ItMechanism of the Lithal (LAH) reduction of cinnamaldehyde.
The reduction of cinnamaldehyde by lithium aluminium hydride (LAH) was reported in a classic series of experiments[1],[2],[3] dating from 1947-8. The reaction was first introduced into the organic ...
Read ItVSEPR Theory: A closer look at chlorine trifluoride, ClF3.
Valence shell electron pair repulsion theory is a simple way of rationalising the shapes of many compounds in which a main group element is surrounded by ligands. ClF3 is a good illustration of thi...
Read ItHow many water molecules does it take to ionise HF and HBr?
No doubt answers to the question posed in the previous post are already being obtained by experiment. Just in case that does not emerge in the next day or so, I offer a prediction here. The methodo...
Read ItHow many water molecules does it take to ionise HCN/HNC? An NCI exploration.
HCN is a weak acid (pKa +9.2, weaker than e.g. HF), although it does have an isomer, isocyanic acid or HNC (pka < +9.2 ?) which is simultaneously stronger and less stable. I conclude my halide a...
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