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Syntheses and Structures of Silver and Copper Coordination Polymers with 4,4′‐Azopyridine − Effect of Counter Anions and π−π Interactions on the Network Systems
Author(s) -
He Cheng,
Zhang BingGuang,
Duan Chunying,
Li Jihui,
Meng QingJin
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200012)2000:12<2549::aid-ejic2549>3.0.co;2-d
Subject(s) - chemistry , crystallography , octahedron , copper , molecule , atom (system on chip) , polymer , ion , stereochemistry , tetrahedral molecular geometry , topology (electrical circuits) , crystal structure , combinatorics , mathematics , organic chemistry , computer science , embedded system
The syntheses and structures of [Ag(azpy)](NO 3 )⋅(H 2 O)⋅(CH 3 OH) ( 1 ), [Cu(azpy) 2 ](ClO 4 ) ( 2 ), [Cu(azpy) 2 (H 2 O) 2 ](NO 3 ) 2 ⋅(H 2 O) 2 ( 3 ) and [Cu(azpy) 2 (H 2 O) 2 ](ClO 4 ) 2 ⋅(C 2 H 5 OH) 2 ( 4 ), where azpy = trans‐4,4′‐azopyridine, are reported to test the dependence of network topology on counter anions and π−π interactions. Complex 1 contains pairs of linear chains of alternating Ag I ions and azpy ligands, resembling a ladder structure in which the ligands form π−π interactions (with a distance of 3.53 Å) and AgAg interactions (with a distance of 3.30 Å). Complex 2 exists as a 3D adamantoid polymer in which each Cu I center is coordinated to four azpy ligands in a tetrahedral geometry, the ligands are in turn coordinated to four other Cu I centers. The cavities are filled with four other adamantoid units forming five interpenetrating networks. Complexes 3 and 4 are composed of two‐dimensional sheets in which the Cu II atom is coordinated in an octahedral geometry to two water molecules and four ligands. The ligands are in turn coordinated to four other Cu II centers. While the sheets in complex 3 display inclined 2D interpenetration, the sheets in complex 4 are all parallel and isolated, with an intersheet separation of ca. 4.7 Å.