Charge stabilization in cationic anthronyl-substituted alkynes: synthesis, characterization and X-ray molecular structures of M2L6 complexed alkynyl-substituted C10-anthrone [M2L6(μ,η2,η2-R2CCC(OR1)(C13H8O))] (M2L6 Co2(CO)6, MoCoCp(CO)5)