A comparison of the coordination preferences of Zn, Co, and Cd(II) with the heteroscorpionate ligand (2-hydroxy-3-t-butyl-methylphenyl)bis (3,5-dimethylpyrazolyl)methane |
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Authors: | Zahida Shirin Brian S Hammes Chris R Warthen Carl J Carrano |
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Institution: | (1) Department of Chemistry and Biochemistry, Southwest Texas State University, San Marcos, Texas |
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Abstract: | Reaction of the Zn, Cd, or Co nitrate salts with the deprotonated ligand (2-hydroxy-3-t-butyl-methylphenyl)bis(3,5-dimethylpyrazolyl)methane (L1O–) in methanol produced the following complexes: (L1OH)Zn(NO3)2] in two isomorphs, a = 40.983(8) Å, b = 9.571(2) Å, c = 15.667(8) Å, = 90 , = 106.38(1) , = 90 , C2/c, and a = 13.027(3) Å, b = 14.781(4) Å, c = 16.107(3) Å, = 90 , = 105.30(1) , = 90 , P21/n; (L1OH)Cd(pz)(NO3)2] a = 14.7476(2) Å, b = 13.5411(2) Å, c = 16.7223(2) Å, = 90 , = 110.3840(10) , = 90 , P21/c; and (L1O)Co(pz)(NO3)] a = 11.4240(2) Å, b = 13.4498(2) Å, c = 13.8056(2) Å, = 105.2080(10) , = 105.8130(10) , = 112.7470(10) , P
. The Zn adopts a pseudotetrahedral four-coordinate geometry where the potentially tridentate ligand is actually bidentate with a protonated and uncoordinated phenoxy arm. The Co complex is pseudooctahedral six-coordinate where the phenoxy arm is deprotonated and coordinated. Finally the Cd complex is seven-coordinate but the metal is not coordinated through the phenoxy group that is again protonated. |
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Keywords: | Coordination preferences heteroscorpionate ligands Zn Co Cd |
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