Sintesis Dan Karakterisasi Senyawa Kompleks dari Perak Asetat dan 1,4-Bis (Difenilfosfino) Butana dengan Stoikiometri 2:1
Keywords:
senyawa koordinasi, perak asetat, 1,4-bis(difenilfosfino)butanaAbstract
Reaction of silver acetate (AgCH3COO) and 1,4-bis(diphenylphosphino)butane (dppb) with 2 : 1 stoichiometry produce colorless crystals, prismatic, and melted at 149-150 degree celcius, indicating the compound is new and pure. Results of EDX analysis gives an empirical formula C16H17AgO2P. Electrical conductivity and qualitative acetate ion test incidated that the compound is molecular. Result of characterization give chemical formula [Ag2(O2C- CH3)2(dppb)]. Three possible structures of these compound are [Ag2(O2CCH3)2(dppb)]2 with trigonal planar geometry, [(AgCH3COO)2(dppb)]2 with distorted trigonal planar geometry, and [Ag2(O2CCH3)2(dppb)]2 with distorted tetrahdral geometry. Free energy of the compound is -417, -417 and -439 kJ/mole respectively. Accepted structure is [Ag2(O2C- CH3)2(dppb)]2 with distorted tetrahedral geometryy around the central atom and having the lowest free energy. This structure resembles [Ag2(O2CCH3)2(dppb)]2.
Reaksi antara perak asetat (AgCH3COO) dan 1,4-bis(difenilfosfino)butana (dppb) dengan stoikiometri 2 : 1 menghasilkan kristal-kristal tidak berwarna, berbentuk prisma, dan melebur pada suhu 149-150 derajat celcius, yang menunjukkan senyawa tersebut baru dan murni. Hasil analisis EDX memberikan rumus empiris C16H17AgO2P. Hasil uji daya hantar listrik (DHL) dan uji kualitatif ion asetat mengindikasikan senyawa kompleks yang diperoleh adalah senyawa molekuler. Berdasarkan hasil karakterisasi kimia yang memenuhi adalah [Ag2(O2CCH3)2(dppb)]. Kompleks tersebut memiliki tiga kemungkinan struktur yaitu [Ag2(O2CCH3)2(dppb)] dengan geometri trigonal planar, [Ag2(O2CCH3)2(dppb)]2 dengan geometri trigonal planar terdistorsi, dan [Ag2(O2CCH3)2(dppb)]2 dengan geometri tetrahedral terdistorsi. Struktur tersebut memiliki energi bebas per ikatan berturut-turut sebesar -417, 417, dan -439 kJ/mol. Struktur yang diterima adalah [Ag2(O2CCH3)2(dppb)]2 dengan geometri tetrahedral terdistorsi di sekitar atom pusatnya dan memiliki energi bebas per ikatan terendah. Struktur ini isostruktur dengan [Ag2(O2CCH3)2(dppf)]2.
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