An electrochemical sensing platform based on a new copper complex for the determination of hydrogen peroxide and nitrite

Figures & data

Figure 1 ORTEP drawing of [Cu(C₁₂H₂₃N₃)₄Br₂·2H₂O] with partial atomic numbering.

Table 1 Crystal data and structure refinement for the title complex.

Empirical formula	C48H96Br2CuN12O2
Formula weight	1096.7
Temperature (K)	293(2)
Wavelength (Å)	0.71073
Crystal system, space group	Triclinic, P1 (No. 1)
Unit cell dimensions
a (Å)	7.696(2)
b (Å)	9.156(2)
c (Å)	22.680(5)
α (°)	85.157(4)
β (°)	88.883(4)
γ (°)	67.764(3)
Volume (Å^3)	1473.8(6)
Z, Calculated density (Mg m^−3)	1, 1.233
Absorption coefficient (mm^−1)	1.770
F(000)	581
Theta range for data collection (°)	0.90–28.37
Limiting indices	−9h 10, −12 k 12,
	−30 l 22
Reflections collected/unique	9736/6864 [R(int) = 0.0220]
Completeness to θ=28.37 (%)	92.7
Data/restraints/parameters	6864/0/306
Goodness-of-fit on F^2	0.891
Final R indices [I>2σ(I)]	R1=0.0464, wR2 = 0.1132
R indices (all data)	R1= 0.0936, wR2 = 0.1436
Largest diff. peak and hole (e Å^−3)	0.556 and −0.496

Figure 2 CVs of the Cu-CPE in 0.1 M, pH 6.1, B–R buffer solution. Curves (a–e) correspond to the scan rates 0.05, 0.06, 0.07, 0.08 and 0.10 V s⁻¹, respectively. Inset: peak current versus the scan rate.

Figure 3 CVs of Cu-CPE in 0.1 M, pH 6.1, B–R buffer solution containing (a–e) 0, 0.2, 0.5, 1.0 and 2.0 μM hydrogen peroxide with the scan rate of 0.08 V s⁻¹. Inset: peak current versus hydrogen peroxide concentration.

Figure 4 CVs of Cu-CPE in 0.1 M, pH 6.1, B–R buffer solution (a–d) containing 0, 0.5, 1.0 and 2.0 μM nitrite with the scan rate of 0.08 V s⁻¹. Inset: peak current versus nitrite concentration.