Research speed reading in 2021. Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent，Which mentioned a new discovery about Product Details of 166591-85-1, molcular formula is C15H19NO4, introducing its new discovery. , Product Details of 166591-85-1
Ethynylene and rho-phenylene are frequently employed constitutional units in constructing the backbone of nanoscopic molecules with specific shape and mechanical or electronic function. How well these properties are defined depends on the flexibility of the backbone, which can be characterized via the end-to-end distance distribution. This distribution is accessible by pulse electron paramagnetic resonance (EPR) distance measurements between spin labels that are attached at the backbone. Four sets of oligomers with different sequences of rho-phenylene and ethynylene units and different spin labels were prepared using polar tagging as a tool for simple isolation of the targeted compounds. By variation of backbone length, of the sequence of rho-phenylene and ethynylene units, and of the spin labels a consistent coarse-grained model for backbone flexibility of oligo(rho-phenyleneethynylene)s and oligo(rho-phenylenebutadiynylene)s is obtained. The relation of this harmonic segmented chain model to the worm-like chain model for shape-persistent polymers and to atomistic molecular dynamics simulations is discussed. Oligo(rho-phenylene butadiynylene)s are found to be more flexible than oligo(rho-phenyleneethynylene)s, but only slightly so. The end-to-end distance distribution measured in a glassy state of the solvent at a temperature of 50 K is found to depend on the glass transition temperature of the solvent. In the range between 91 and 373 K this dependence is in quantitative agreement with expectations for flexibility due to harmonic bending. For the persistence lengths at 298 K our data predict values of (13.8 ± 1.5) nm for poly(rho-phenyleneethynylene)s and of (11.8 ± 1.5) nm for poly(rho-phenylenebutadiynylene)s.
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Reference：
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem