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Two‐Dimensional Divalent Metal Coordination Polymers Containing 3,4′‐Dipyridylketone Tethers: Layer Topology Tuning by Anion Binding Preferences
Author(s) -
Farnum Gregory A.,
Montney Matthew R.,
Supkowski Ronald M.,
LaDuca Robert L.
Publication year - 2009
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200900150
Subject(s) - thiocyanate , perchlorate , crystallography , cationic polymerization , cobalt , chemistry , hydrogen bond , coordination polymer , supramolecular chemistry , metal , polymer , thermal decomposition , crystal structure , ion , inorganic chemistry , molecule , polymer chemistry , organic chemistry
Slow diffusion of aqueous cobalt thiocyanate or cadmium perchlorate and ethanolic solutions of 3,4′‐dipyridylketone (3,4′‐dpk) generated the coordination polymers {[Co(NCS) 2 (3,4′‐dpk) 2 ]·2H 2 O} n ( 1 ) and {[Cd(H 2 O) 2 (3,4′‐dpk) 2 ](ClO 4 ) 2 ·2H 2 O} n ( 2 ), which were structurally characterized by single‐crystal X‐ray diffraction. The structure of 1 consists of interdigitated neutral [Co(NCS) 2 (3,4′‐dpk) 2 ] n (4,4) rectangular grid coordination polymer layers. However, compound 2 manifests cationic [Cd(H 2 O) 2 (3,4′‐dpk) 2 ] n 2n + two‐dimensional (6,3) herringbone lattices connected through hydrogen bonding mediated by interlamellar unligated perchlorate anions. Upon excitation with ultraviolet radiation, 2 emits blue‐violet light, ascribed to π–π* transitions within the pyridyl rings of the 3,4′‐dpk ligands. Thermal decomposition behavior of 1 is also discussed.