Tetradecylphosphonic acid

Because Cd(CH3)2 is extremely toxic, pyrophoric, and explosive at elevated temperatures, other Cd sources have been used. CdO appears to be an interesting precursor. CdO powder dissolves in TOPO and HPA (hypophosphorous acid) or TDPA (tetradecylphosphonic acid) at about 300 °C giving a colorless homogeneous solution. By introducing selenium or tellurium dissolved in TOP, nanocrystals grow to the desired size. 

CdMe2 = dimethylcadmium, ZnEt2 = diethylzinc, TMS = trimethylsilyl, (BDMS)2Te = bis(tert-butyldimethylsilyl) telluride, TDPA = tetradecylphosphonic acid, ODPA = octadecylphosphonic acid, SA = stearic acid, LA = lauric acid, OA = oleic acid, MA = myristic acid, ac = acetate, my = myristate, st = stearate, hdx = hexadecylxanthate, ex = ethylxanthate, dx = decylxanthate, TOPO = trioctylphos-phine oxide, HDA = hexadecylamine, DA = dodecylamine, ODA = octadecylamine, TOP = trioctylphosphine, TBP = tributylphosphine, ODE = 1-octadecene, HH = hexadecyl hexadecanoate,... 

Rod growth dynamics also depend upon the identity of the phosphonic acid. The effectiveness of the phosphonic acid in promoting rod growth depends critically on its steric bulk, or the length of its alkyl chain. Shorter-chain phosphonic acids, such as HPA, more effectively promote rod growth compared to longer-chain phosphonic acids, such as tetradecylphosphonic acid (TOPA). Combinations of longer-and shorter-chain phosphonic acids can be used to readily tune rod aspect ratios and control shape evolution dynamics. 

Single-wall carbon nanotube Size quantization Tetradecylphosphonic acid Thin-fllm electroluminescence Thorium... 

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