Novel Mononuclear and polynuclear Phosphate-calcium Complexes with Bulky Acylamino-substituents.
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Accession number;00A0163492
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| Title;Novel Mononuclear and polynuclear Phosphate-calcium Complexes with Bulky Acylamino-substituents. |
| Author;
ONODA AKIRA
(Osaka Univ., Grad. Sch.)
OKAMURA TAKAAKI
(Osaka Univ., Grad. Sch.)
UEYAMA NORIKAZU
(Osaka Univ., Grad. Sch.)
NAKAMURA AKIRA
(Toho Univ., Fac. of Sc.)
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Journal Title;Abstracts. Symposium on Biofunctional Chemistry
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Journal Code:L0836A
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ISSN:
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VOL.14th;NO.;PAGE.66-67(1999)
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| Figure&Table&Reference; |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;We have prepared novel phosphoric acid ligands with bulky amide in ortho position, 2,6-(PhCONH)2C6H3OPO3H2 (1) and 2,6-(Ph3CCONH)2C6H3OPO3H2 (2) and synthesized the Ca(II) complexes. The reported calcium-phosphate complexes have layered and one-dimensional chain structure, which Ca(II) centers have a symmetric coordination of ligands. However, bulky ligand, 1, restricts the symmetric coordination to form a zigzag chain Ca(II) complex, [CaII{O2P(O)O-2,6-(NHCOPh)2C6H3}(H2O)5(EtOH)]n (3). The mononuclear Ca(II) core is formed in (NMe4)[CaII{O2(OH)O-2,6-(NHCOCPh3)2}3 (N.IDN.CMe)3] (4) with highly bulky ligand, 2. In the Ca(II) complexes with phosphate monoanion ligands, layered (Figure 3a) and antiparallel one dimensional OH...O=P hydrogen bonds are found. Tris Ca(II) complex, 4, has novel cyclic OH...O=P hydrogen bonds. Due to the hydrogen bonds, the ligands exist on the one side of Ca(II) ion. This cyclic hydrogen bonds are speculated to be important in the interface structure between hydroxyapatite and binding biopolymers. (author abst.) |
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