The assignment of Co-C bond stretching vibrational frequency of CH₃Co(DH)₂H₂O in IR and Raman spectra

Abstract

In order to aid assignment of Co-C bond stretching vibrational frequency of CH&o@H)2H20 @H=dimethylglyoximato monanion) in IR and Raman spectra, its isotopic substitution CD&o(DH)zH20 has been synthesized and normal coordinate analyses on the two complex have been made. The bands were assigned in terms of potential energy distribution. The results provide definitive band assignment of the Co-C bond and Co-N bond stretching modes which are coupling at 511 cm-'.

Ultrathin 2D Cobalt Zeolite‐Imidazole Framework Nanosheets for Electrocatalytic Oxygen Evolution

“…At open circuit potential (OCP), i.e., without an externally applied potential, the most imminent Raman bands were at 465.4, 521.3, 548.1, 642, and 778.5 cm −1 . The band at ≈521.3 cm −1 is assigned to Co(OH) 2 species and is due to ν(Co–O) (A g ) symmetric stretching mode, while that at ≈548.1 cm −1 is due to ν(Co–N) stretching mode . Upon application of an oxidizing potential, the bands at 465.4 cm −1 and at 548.1 cm −1 diminish in intensity while the one at 523 cm −1 is accentuated.…”

“…The band at ≈521.3 cm −1 is assigned to Co(OH) 2 species and is due to ν(Co-O) (A g ) symmetric stretching mode, while that at ≈548.1 cm −1 is due to ν(Co-N) stretching mode. [39][40][41] Upon application of an oxidizing potential, the bands at 465.4 cm −1 and at 548.1 cm −1 diminish in intensity while the one at 523 cm −1 is accentuated. Meanwhile, the band at 778.5 cm −1 , ascribed to deformation of the complex, also decreases in intensity with increase of the applied potential.…”

Silica iminopyridine‐functionalized nanomaghemite enhances the oxygenation activity and durability of simple Co(II) salophen complex

“…A slight blue shift of C=N band of Co(II) salophen at 1601 ( Figure S2) to 1605 cm −1 (Figure 1d) as well as a new weak band as a shoulder at 483 cm −1 rationalized to the stretching vibrations of the Co-N bond (Figure 1d), testify the successful immobilization of Co(II) salophen complex on the surface of magnetic nanoparticles. [19,25,26] The incorporation of the Co(II) salophen complex into the magnetic catalyst (SMNP@SIPy) was also confirmed by elemental composition determined by EDX ( Figure 2). The distinct peaks of Co and Fe were appeared clearly alongside carbon, nitrogen, oxygen and silicon in the EDX spectrum.…”

“… The appearance of new peaks in Figure d at about 1250–1600 cm −1 are attributed to Co(II) salophen complex attached to maghemite core. A slight blue shift of C=N band of Co(II) salophen at 1601 (Figure S2) to 1605 cm −1 (Figure d) as well as a new weak band as a shoulder at 483 cm −1 rationalized to the stretching vibrations of the Co–N bond (Figure d), testify the successful immobilization of Co(II) salophen complex on the surface of magnetic nanoparticles …”

Dual Role of Au nanoparticles in the Catalytic Formation of an Amorphous Polynuclear Peroxo Complex and Surface Enhanced Resonance Raman Scattering

“…It is evident from the TEM image -as shown in Figure 2B -that the Au nanoparticles were trapped into polymer-like amorphous product (Figure S9, SI), which might have been possible through the interaction between pyridine-N and the Au nanoparticle surface. [30,31] When the complexation reaction (i. e., reaction between 2-PA and Co(II) in basic media) was carried out in the presence of the Au nanoparticles (of 196 pM concentration), the time-dependent Raman signals improved significantly as shown in Figure 2C.…”