MYTUTOR SUBJECT ANSWERS

231 views

Why do d-block elements have coloured complexes?

In complexes the d orbitals are split into two distinct levels, they are not degenerate (of equal energy) as they are in free ions. 

The energy difference between the levels corresponds to a particular wavelength or frequency in the visible region of the spectrum.

When light hits the complex, the energy of the corresponding wavelength is absorbed and electrons are excited from the lower energy level of d orbital to the higher level. 

The colour that is visible is the complimentary colour to the wavelengths that have been absorbed (e.g Cu2+(aq) appears blue because the complementary wavelengths of light have been absorbed.)

The colour of the complex depends on the energy difference between the d orbitals which in turn depends on several factors: the nature of the transition metal, the oxidation state, the shape of the complex and the nature of the ligand. This explains why different complexes are different colours.

Hamza R. 11 Plus English tutor, GCSE English tutor, 13 plus  English ...

5 months ago

Answered by Hamza, an IB Chemistry tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

23 SUBJECT SPECIALISTS

£20 /hr

Sophie Z.

Degree: Chemistry (Bachelors) - Edinburgh University

Subjects offered: Chemistry, English+ 2 more

Chemistry
English
Economics
Biology

“I am currently an (environmental) chemistry student at the University of Edinburgh, and I will be the first to admit I am a science geek. Now, if science is not your thing, I hope that by the end of one of my sessions you might start ...”

MyTutor guarantee

£20 /hr

Laura K.

Degree: Chemical Engineering (Masters) - Bath University

Subjects offered: Chemistry, Science+ 3 more

Chemistry
Science
Physics
Maths
Further Mathematics

“Hey there! I am Laura and I am currently studying Chemical Engineering at University of Bath. I am really passionate about Science and I am willing to share my knowledge through tutoring you. My passion and expertise in science can be...”

£20 /hr

Alexandra B.

Degree: Natural Sciences (Biologial) (Bachelors) - Cambridge University

Subjects offered: Chemistry, Maths+ 4 more

Chemistry
Maths
French
Biology
-Personal Statements-
-Oxbridge Preparation-

“About Me: I am a Natural Sciences student in my 2nd year at Cambridge, currently focusing more on the Biological side. Having seen the difference good teachers made in my own school career, I'm hoping to now pass this on!  Having had...”

MyTutor guarantee

About the author

Hamza R.

Currently unavailable:

Degree: English Literature (Bachelors) - Durham University

Subjects offered: Chemistry, Maths+ 3 more

Chemistry
Maths
English
Biology
-Personal Statements-

“​ About Me: I'm just about to start my second year studying English Literature at Durham University. I'm an avid reader and I'd love to inspire a love of literature in any students I tutor. I managed to score a rare 45 points in the ...”

You may also like...

Posts by Hamza

How can immunity be acquired?

Why do d-block elements have coloured complexes?

Other IB Chemistry questions

Why do melting points decrease down the group 1 and increade down the group 7? (core syllabus: Periodicity)

Cu2+ (aq) reacts with ammonia to form the complex ion [Cu(NH)3)4]2+. Explain this reaction in terms of acid-base theory, and outline the bonding in the complex formed between Cu2+ and NH3

Calculate the pH of a 4.00 x 10^-2 mol dm^-3 solution of Ba(OH)2

Why do d-block elements have coloured complexes?

View IB Chemistry tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok