Photochromic polyphosphazenes with spiropyran units was written by Allcock, Harry R.;Kim, Chulhee. And the article was included in Macromolecules in 1991.Name: 2-(2-(2-((Tetrahydro-2H-pyran-2-yl)oxy)ethoxy)ethoxy)ethan-1-ol This article mentions the following:
Photochromic spiropyrans were linked to polyphosphazenes through O(CH2CH2O)nO (n = 2, 3) spacers. The reversion of photogenerated merocyanine groups to spiropyran units in the solid state was much slower than in solution (increasing with increasing polarity for the latter). Solid-state reversion was slower for a polymer containing all spiropyran units than for one containing mixed substituents, presumably a steric effect. Reversion was slower for polymers with a diethyleneoxy spacer than with a triethyleneoxy unit. Reversions in THF and the solid state were modeled by a biexponential process. The overall phenomena were explained by the solvation or aggregation of the polymer chains in solution as well as by the existence of 2 different environments for the merocyanine units. In the experiment, the researchers used many compounds, for example, 2-(2-(2-((Tetrahydro-2H-pyran-2-yl)oxy)ethoxy)ethoxy)ethan-1-ol (cas: 60221-37-6Name: 2-(2-(2-((Tetrahydro-2H-pyran-2-yl)oxy)ethoxy)ethoxy)ethan-1-ol).
2-(2-(2-((Tetrahydro-2H-pyran-2-yl)oxy)ethoxy)ethoxy)ethan-1-ol (cas: 60221-37-6) belongs to ethers. The oxygen atom in ethers are more electronegative than carbon, thus the hydrogens which are alpha to the ethers are more acidic than the simple hydrocarbons. Ethers feature bent C–O–C linkages. In dimethyl ether, the bond angle is 111° and C–O distances are 141 pm. The barrier to rotation about the C–O bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.Name: 2-(2-(2-((Tetrahydro-2H-pyran-2-yl)oxy)ethoxy)ethoxy)ethan-1-ol
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem