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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: aimeerider on April 22, 2005, 06:48:28 AM

Title: isomerisation in complexes
Post by: aimeerider on April 22, 2005, 06:48:28 AM

Im having a really tough time describing the role of potassium cations and the water in the compound K4[Ni(NCS)6].4H2O, ive been trying to find the structure but im drawing a blank.

Any help would greatly be appreciated
 ???

Title: Re:isomerisation in complexes
Post by: dipic on May 11, 2005, 09:57:52 PM

The NCS has a -1 charge, Ni is 2+, so 4 K  are needed to balance the 4- charge. The K and water will sit in the crystal lattice associated with the central octahedral complex [Ni(NCS)6].  In this case isomerism may occur with the following: K4[Ni(H2O)(NCS)5](SCN).3H2O, K4[Ni(H2O)2(NCS)4](SCN)2 .2H2O etc.

Hope that helps.

Title: Re:isomerisation in complexes
Post by: dipic on May 12, 2005, 09:49:48 AM

I hope you also see that NCS can coordinate to Ni via the N or S. So isomerisation can occur that way as well.