Détermination structurale du poly{bis[(butoxycarbonylméthylcarbamoyloxy)-4 butyl]-1,2 butène-1 yne-3 ylène} [poly(4BCMU)] par minimisation des energies d'interactions moléculaires

Structural study of two reactive diacetylenes

“…Apparently, this disorder persists in the pure polymer [44]. In the most detailed crys- tallographic investigation of poly-4BCMU [45], hkl reflections are reported to be very diffuse; no hkl and only 43 hk0 reflections could be recorded. The determined structure is orthorhombic with a = 53.75(2) Å , b = 10.997(3) Å , c = 4.880(5) Å , Z = 4, proposed group no.…”

Photopolymerization of Thin Polycrystalline Diacetylene Films and Quenching of the Precursor Excited State

“…29 During polymerization it varies by 1.6% only in 4B. 30 The corresponding value for 3B is not known. Several areas on the same film and several sets of two films from the same batch were measured to check that they indeed have the same uniform thickness.…”

Synthesis of ladder polymers containing polydiacetylene backbones connected with methylene chains and their optical properties

“…From the general consideration, monomer structures in crystals are not highly folded and strained in form, which is energetically unfavorable. Actually, side groups of a simple DA and PDA with similar substituents to 4BCMU4A(n) [i.e., 3BCMU 23 and poly(4BCMU) 24 in which nB-CMU is originated from the chemical structure of ROC'COC'COR, where R ϭ O(CH 2 ) n OCO NHCH 2 COOC 4 H 9 ] were found to be rather extended in form. Thus, molecular structure of 4BCMU4A(n) in crystals could also be extended in form by analogy.…”