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- W2022773864 abstract "In catena -poly[[dichloridocobalt(II)]-μ-(1,1′-dimethyl-4,4′-bipyrazole-κ 2 N 2 : N 2′ )], [CoCl 2 (C 8 H 10 N 4 )] n , (1), two independent bipyrazole ligands (Me 2 bpz) are situated across centres of inversion and in tetraaquabis(1,1′-dimethyl-4,4′-bipyrazole-κ N 2 )cobalt(II) dichloride–1,1′-dimethyl-4,4′-bipyrazole–water (1/2/2), [Co(C 8 H 10 N 4 ) 2 (H 2 O) 4 ]Cl 2 ·2C 8 H 10 N 4 ·2H 2 O, (2), the Co 2+ cation lies on an inversion centre and two noncoordinated Me 2 bpz molecules are also situated across centres of inversion. The compounds are the first complexes involving N , N ′-disubstituted 4,4′-bipyrazole tectons. They reveal a relatively poor coordination ability of the ligand, resulting in a Co–pyrazole coordination ratio of only 1:2. Compound (1) adopts a zigzag chain structure with bitopic Me 2 bpz links between tetrahedral Co II ions. Interchain interactions occur by means of very weak C—H...Cl hydrogen bonding. Complex (2) comprises discrete octahedral trans -[Co(Me 2 bpz) 2 (H 2 O) 4 ] 2+ cations formed by monodentate Me 2 bpz ligands. Two equivalents of additional noncoordinated Me 2 bpz tectons are important as `second-sphere ligands' connecting the cations by means of relatively strong O—H...N hydrogen bonding with generation of doubly interpenetrated pcu (α-Po) frameworks. Noncoordinated chloride anions and solvent water molecules afford hydrogen-bonded [(Cl − ) 2 (H 2 O) 2 ] rhombs, which establish topological links between the above frameworks, producing a rare eight-coordinated uninodal net of {4 24 .5.6 3 } ( ilc ) topology." @default.
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- W2022773864 date "2014-02-08" @default.
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- W2022773864 title "Cobalt(II) chloride complexes with 1,1′-dimethyl-4,4′-bipyrazole featuring first- and second-sphere coordination of the ligand" @default.
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- W2022773864 doi "https://doi.org/10.1107/s2053229614002046" @default.
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