**4. Conclusion**

**Figure 13.** CCDC **METSUZ** [24].The compound has a formula C30H26N4O6Zn. Novel feature mentioned is that it crystalli‐ zes in the noncentrosymmetric space groups. The geometry around the Zn(II) metalcenter is pseudo-tetrahedral with two oxygen and two nitrogen atoms from the ligands and has the Λ absoluteconfiguration. Apparently conformation‐

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In principle, induced CD is caused by non-contact interactions between (electric) dipole mo‐ ments of chiral additives and achiral materials. Because it is an electromagnetic phenomen‐ on essentially, contact intermolecular interactions, in other words molecular recognition,

al change was slight, namely it remained a twist (about 90 degree) from.

As summarized in Figure 1[right], according to chemical structures, Zn(II) center and naph‐ tylgroups are suitable factors for induced CD, while 3,5-dichlorosalycilaldehyde moieties are not regardless of common factors. Previous study [11] revealed that in optimized struc‐ ture, naphtylgroups act as largely spread planar parts outside of a molecular face, which plays an important role in induced CD for this case. In the present study, compounds hav‐ ing identical features were also investigated in view of optimized structures. According to not only3,5-dichlorosalycilaldehyde moieties (**IBHBCU01** and **MAJCUW**) but also tert-Bugroups (**MIMTOS01** and **YUBLAJ**), EtO- groups (**MAJNIV**), and NO2- groups (**METSUZ**) gave significantly large steric hindrance resulting in steric repulsion between ligands. How‐ ever, specific geometry could not be induced by bulky groups. Generally, Zn(II) complexes afford a tetrahedral coordination geometry, which prevents from forming flatten planar mo‐ lecular shapes in view of ligands. Therefore, these two factors may not be definitive factors solely. On the other hand, besides in amine parts (Figure 1), naphtylgroups in aldehyde parts (**KUPBIH** and **KUPBON**) are also keeping appropriate conditions, namely largely spread planar parts outside of a molecular face. As far as in the sense of molecular recogni‐ tion, it has advantage for penetrating into inside of dendrimer as well as contacting to the surface of metal nano-particles. Further experimental and/or theoretical investigation in‐ cluding electric factors will be necessary to understand deeply.

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Molecular Recognition of Trans-Chiral Schiff Base Metal Complexes for Induced CD

[10] Akitsu, T., Yamaguchi, J., Aritake, Y., Hiratsuka, T., & Uchida, N(201. N((2010). Ob‐ servation of enhanced CD bands of metal complexes, metallodendrimers, and metal

[11] Akitsu, T., & Uchida, N(201. N((2010). Induced d-d bands in CD spectra of solution of chiral Schiff base nickel(II) complex and ferrocene. Asian chem.lett. , 14, 21-28.

[12] Aritake, Y., Nakayama, T., Nishizuru, H., & Akitsu, T. ((2011). Observation of in‐ duced CD on CdSenano-particles from chiral Schiff base Ni(II), Cu(II), Zn(II) com‐

[14] Yamaguchi, J., & Akitsu, T(201. T((2011). Molecular recognition of chiral Schiff base metal complexes for induced CD bands to metallodendrimers. Int. j. curr. chem. , 2,

[15] Cambridge Structural Database System, Cambridge Crystallographic Data Centre,

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phenylethyl)salicylideneaminato-k2

neaminato-k2

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m642.

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