title: Synthesis of zigzag-chain and cyclic-octanuclear calcium complexes and hexanuclear bulky aryl-phosphate sodium complexes with ortho-amide groups: structural transformation involving a network of inter- and intramolecular hydrogen bonds.
abstract: Three new polynuclear Ca(II)- and Na(I) phosphate complexes with two strategically oriented bulky amide groups, 2,6-(PhCONH)(2)C(6)H(3)OPO(3)H(2), were synthesized, including one with a zigzag-chain, [Ca(II)[O(3)POC(6)H(3)-2,6-(NHCOPh)(2)](H(2)O)(4)(EtOH)](n), a cyclic-octanuclear form, [Ca(II)(8)[O(3)POC(6)H(3)-2,6-(NHCOPh)(2)](8)(O=CHNMe(2))(8)(H(2)O)(12)], and a hexanuclear complex, (NHEt(3))[Na(3)[O(3)POC(6)H(3)-2,6-(NHCOPh)(2)](2)(H(2)O)(MeOH)(7)]. X-ray crystallography revealed that all have an unsymmetric ligand position due to the bulky amide groups. A dynamic transformation of the Ca(II) zigzag-chain structure to the cyclic-octanuclear complex was induced by changing coordination of DMF molecules, which caused a reorganization of the intermolecular/intramolecular hydrogen bond network.
authors.affiliation: Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Onoda
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yamada
authors.forename: Taka-aki
authors.initials: TA
authors.lastname: Okamura
authors.forename: Mototsugu
authors.initials: M
authors.lastname: Doi
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Yamamoto
authors.forename: Norikazu
authors.initials: N
authors.lastname: Ueyama
mesh_terms: D000577:Amides / Q000138:chemical synthesis* / Q000737:chemistry; D002118:Calcium / Q000737:chemistry*; D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D015394:Molecular Structure; D010755:Organophosphates / Q000138:chemical synthesis* / Q000737:chemistry; D011084:Polycyclic Aromatic Hydrocarbons / Q000138:chemical synthesis* / Q000737:chemistry; D013055:Spectrophotometry, Infrared
chemical_list: D000577:Amides; D010755:Organophosphates; D011084:Polycyclic Aromatic Hydrocarbons; D002118:Calcium