1. Dept. of Pure and Industrial Chemistry, Univ. of Nigeria, Nsukka, Enugu State 410001, Nigeria. ORCID: .
2. Dept. of Pure and Industrial Chemistry, Univ. of Nigeria, Nsukka, Enugu State 410001, Nigeria (corresponding author).
3. Professor, Dept. of Pure and Industrial Chemistry, Univ. of Nigeria, Nsukka, Enugu State 410001, Nigeria.
4. Dept. of Pure and Industrial Chemistry, Univ. of Nigeria, Nsukka, Enugu State 410001, Nigeria.
5. Dept. of Pure and Industrial Chemistry, Univ. of Nigeria, Nsukka, Enugu State 410001, Nigeria; Central Science Laboratory, Univ. of Nigeria, Nsukka, Enugu State 410001, Nigeria. ORCID: .
6. Professor, Dept. of Pure and Industrial Chemistry, Univ. of Nigeria, Nsukka, Enugu State 410001, Nigeria. ORCID: .