| CPC G01N 27/3277 (2013.01) [C07F 15/002 (2013.01); G01N 27/3271 (2013.01); A61B 5/14532 (2013.01); A61B 5/14865 (2013.01)] | 4 Claims |

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1. A transition metal complex useful as electron transport media having the following chemical structural formula:
[M(C—N)α(N—N)3-α]mdX [Chemical Formula 1]
wherein, M is Os;
α is an integer of 1;
m is a negative or positive charge representing −1 to −5 or 1 to 5;
d is an integer from 0 to 2;
X is a counter ion;
C—N is one selected from the group consisting of
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N—N is one selected from the group consisting of
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