Compounds for the measurement of the oxygen concentration

A compound according to formula (I):

• wherein,
• M is a transition metal;
• R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from the group consisting of hydrogen, halogen, optionally substituted C1-C6 alkyl, C1-C6 haloalkyl, optionally substituted C2-C6 alkenyl, optionally substituted C2-C6 alkynyl, optionally substituted C3-8 cycloalkyl, optionally substituted C6-C14 aryl, optionally substituted heteroaryl and —N(Y)2;
• n is 0 to 4;
• Y is a C1-C6 alkyl, or a C1-C6 haloalkyl;
• X is C or N;
• and
• Z is independently selected from the list consisting of S, Se, and Te.

A polymeric nanoparticle loaded with a compound according to Formula (I):

• wherein,
• M is a transition metal;
• R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from the group consisting of hydrogen, halogen, optionally substituted C1-C6 alkyl, C1-C6 haloalkyl, optionally substituted C2-C6 alkenyl, optionally substituted C2-C6 alkynyl, optionally substituted C3-8 cycloalkyl, optionally substituted C6-C14 aryl, optionally substituted heteroaryl and —N(Y)2;
• n is 0 to 4;
• Y is a C1-C6 alkyl, or a C1-C6 haloalkyl;
• X is C or N;
• and
• Z is independently selected from the list consisting of S, Se, and Te;
• or Formula (Ia):
• or Formula (1b):

Use of a compound according to Formula (I):

• wherein,
• M is a transition metal;
• R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from the group consisting of hydrogen, halogen, optionally substituted C1-C6 alkyl, C1-C6 haloalkyl, optionally substituted C2-C6 alkenyl, optionally substituted C2-C6 alkynyl, optionally substituted C3-8 cycloalkyl, optionally substituted C6-C14 aryl, optionally substituted heteroaryl and —N(Y)2;
• n is 0 to 4;
• Y is a C1-C6 alkyl, or a C1-C6 haloalkyl;
• X is C or N;
• and
• Z is independently selected from the list consisting of S, Se, and Te;
• or
• Formula (Ia):
• Formula (1b):
• for determining the concentration of oxygen in a medium.

A method of measuring the concentration of oxygen in a medium comprising using a compound according to Formula (I):

• wherein,
• M is a transition metal;
• R1, R2, R3, R4, R5, R6, R7 and R8 are each independently selected from the group consisting of hydrogen, halogen, optionally substituted C1-C6 alkyl, C1-C6 haloalkyl, optionally substituted C2-C6 alkenyl, optionally substituted C2-C6 alkynyl, optionally substituted C3-8 cycloalkyl, optionally substituted C6-C14 aryl, optionally substituted heteroaryl and —N(Y)2;
• n is 0 to 4;
• Y is a C1-C6 alkyl, or a C1-C6 haloalkyl;
• X is C or N;
• and
• Z is independently selected from the list consisting of S, Se, and Te;
• or
• Formula (Ia):
• Formula (1b):