• Z5 / The science

What is singlet oxygen?

What is singlet oxygen?


Oxygen makes up about 20% percent of the air and is essential to life and various chemical reaction.

The oxygen molecule is a diradical, as its lowest electronic state is a triplet (3Σg-) state in which two unpaired electrons are distributed in the two highest occupied degenerate orbitals.

Oxygen in the triplet state (3O2) is not very reactive. However, excitation of the molecule will result in the rearrangement of the electron spins and the orbital occupancy to form two possible singlet electronic states, 1Δg and 1Σg+, who are highly reactive.

Singlet oxygen (1O2) is increasingly used for medical applications such as respiratory, skin and cancer treatment, and industrial applications such as water treatment and inducing chemical reactions.

The 1Σg+ is very reactive and has a relatively short lifetime as it tends to quickly relax to the lower energy 1Δg state.

Therefore, the 1Δg singlet state, that is only 23 kcal above that of the ground state, is the state involved in most oxygen reactions that do not involve radicals and is the state that is referred to when discussing oxygen singlet state, 1O2.


How does Z5 produce singlet oxygen?

How does Z5 produce singlet oxygen?


The Z5 provides a unique metal-based non-irradiative method for producing singlet oxygen-enriched atmosphere from atmospheric air.

The invention here is a metal honeycomb. Air flowing through the honeycomb result in the conversion of oxygen from its triplet ground state to the excited singlet state at relatively low yield.

To our knowledge, this is the first time free singlet oxygen has been shown to be produced due to interaction of flowing air with metals.

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The Z5 is a patented technology. The Z5 Global Group Ltd. international team is currently developing  various Z5-based products for energy and medical applications.