Supramolecular dimer

This idea was realized using crown ether styryl dyes (CESD) lc,d, 4c (Scheme 1,4). The compounds lc,d, 4c having betaine structures form supramolecular dimers with a crossed arrangement of molecules (a h-head-to-tail) in the presence of ions, due to the intermolecular interaction between the sulfo group of one of the molecules and a ion located in the crown-ether cavity of the other molecule [20,21], It was shown that photoirradiation of solutions of dimer results in stereospecific PCA giving only one of the 11 possible derivatives of cyclobutane, which is expected in conformity with the concerted superficial (s,s) addition of the reactants (Scheme 5) [22,23], It is noteworthy... 

Kryatova OP et al (2002) Stable supramolecular dimer of self-complementary benzo-18-crown-6 with a pendent protonated amine arm. Chem Commun 3014-3015... 

VI. OTHER SUPRAMOLECULAR DIMERS WITH LITHIUM A. Dimers of Lithium Isodicyclopentadienide and Cyclopentadienide... 

Fig. 19 Structiue of supramolecular dimers constructed by 6-CiNH-a-CD in aqueous solution...

The fact that 6-CiNH-a-CD formed a supramolecular dimer in which cin-namoyl groups are included from the primary hydroxyl groups led us to use 3-cinnamamide-a-CD (3-CiNH-o -CD) as a building unit, because the phenyl group can be included in a-CD from the primary hydroxyl side successively to form supramolecular polymers. Actually, 3-CiNH-a-CD was found to form long supramolecular polymers with a molecular weight higher than 1.6 x 10 (Fig. 20). 

Figure 3 Supramolecular dimers, trimers, and oligomers generated by H-bonding self-assembly of (a) adenine, (b) uracil, and (c) adenine-uracil base-pair. (R = sugar, alkyl, etc.)...

Fig. 12.4. Daisy-chain supramolecular polymer 8 and cyclic supramolecular dimer 9.

Anderson, H.L., A. Bashall, K. Henrick, M. McPartlin, and J.K.M. Sanders (1994). Crystal-structure of a supramolecular dimer formed by n—n interactions between 2 interlocked cyclic zinc porphyrin trimers. Angew. Chem. Int. Ed. Engl. 33, 429 31. 

Figure 34 Porphyrin-phthalocyanine supramolecular dimer held by electrostatic interactions.

Figure 36 Porphyrin-phthalocyanine supramolecular dimer 56 held together by a combination of ion-dipole and electrostatic interactions.

Figure 37 Pc-Ceo ensemble 57 formed by a zinc crown-ether phthalocyanine supramolecular dimer similar to 54 (Figure 35a) coordinated to a pyridyl-functionalized Cgo component bearing an alkylammonium cation that is able to further interact with one of the crown ether.

Figure 38 Phthalocyanine-Ceo supramolecular dimer held by hydrogen-bonding interactions between crown-ether phthalocyanine 58 and dialalkylammonium-functionalized C 59.

Wang and co-workers used the mono-bromide 3.58 as a key compound to construct a pillar[5]arene-based supramolecular assembly. The monobromide 3.58 was substituted with an amino group by Gabriel synthesis. A mono-ureidopyrimidinone-functionalized pillar[5]arene (3.65) was synthesized from the mono-amine 3.64. 3.65 formed a supramolecular dimer by a quadruple hydrogen bond between ureidopyrimidinone moieties, and addition of a bisparaquat derivative afforded supramolecular polymers at high concentration. 

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